256662661500277 has 2 divisors, whose sum is σ = 256662661500278. Its totient is φ = 256662661500276.

The previous prime is 256662661500197. The next prime is 256662661500319. The reversal of 256662661500277 is 772005166266652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208060026609796 + 48602634890481 = 14424286^2 + 6971559^2 .

It is a cyclic number.

It is not a de Polignac number, because 256662661500277 - 2³⁹ = 256112905686389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256660661500277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128331330750138 + 128331330750139.

It is an arithmetic number, because the mean of its divisors is an integer number (128331330750139).

Almost surely, 2^{256662661500277} is an apocalyptic number.

It is an amenable number.

256662661500277 is a deficient number, since it is larger than the sum of its proper divisors (1).

256662661500277 is an equidigital number, since it uses as much as digits as its factorization.

256662661500277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76204800, while the sum is 61.

The spelling of 256662661500277 in words is "two hundred fifty-six trillion, six hundred sixty-two billion, six hundred sixty-one million, five hundred thousand, two hundred seventy-seven".