16180...05887 (280-digits)

This number is a prime.

1618033988 7498948482 0458683436 5638117720 3091798057 6286213544 8622705260
4628189024 4970720720 4189391137 4847540880 7538689175 2126633862 2235369317
9318006076 6726354433 3890865959 3958290563 8322661319 9282902678 8067520876
6892501711 6962070322 2104321626 9548626296 3136144381 4975870122 0340805887

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A prime formed from first 280 digits of the golden ratio. Other primes formed from decimal expansion of the golden ratio contain 7, 13, and 255 digits. [Gupta]