256549554864 has 30 divisors (see below), whose sum is σ = 717982435196. Its totient is φ = 85516518240.

The previous prime is 256549554847. The next prime is 256549554893. The reversal of 256549554864 is 468455945652.

256549554864 is a `hidden beast` number, since 2 + 5 + 6 + 549 + 5 + 5 + 4 + 86 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 890796922 + ... + 890797209.

Almost surely, 2^256549554864 is an apocalyptic number.

256549554864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256549554864 is an abundant number, since it is smaller than the sum of its proper divisors (461432880332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256549554864 is a wasteful number, since it uses less digits than its factorization.

256549554864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781594145 (or 1781594136 counting only the distinct ones).

The product of its digits is 207360000, while the sum is 63.

The spelling of 256549554864 in words is "two hundred fifty-six billion, five hundred forty-nine million, five hundred fifty-four thousand, eight hundred sixty-four".