256799519977 has 16 divisors (see below), whose sum is σ = 344793762432. Its totient is φ = 184710942720.

The previous prime is 256799519941. The next prime is 256799520001. The reversal of 256799519977 is 779915997652.

It is a cyclic number.

It is not a de Polignac number, because 256799519977 - 2¹¹ = 256799517929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256799519917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128270488 + ... + 128272489.

It is an arithmetic number, because the mean of its divisors is an integer number (21549610152).

Almost surely, 2^256799519977 is an apocalyptic number.

It is an amenable number.

256799519977 is a deficient number, since it is larger than the sum of its proper divisors (87994242455).

256799519977 is a wasteful number, since it uses less digits than its factorization.

256799519977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256543008.

The product of its digits is 675126900, while the sum is 76.

The spelling of 256799519977 in words is "two hundred fifty-six billion, seven hundred ninety-nine million, five hundred nineteen thousand, nine hundred seventy-seven".