256977930309 has 16 divisors (see below), whose sum is σ = 344354623488. Its totient is φ = 170460841712.

The previous prime is 256977930283. The next prime is 256977930323. The reversal of 256977930309 is 903039779652.

It is a cyclic number.

It is not a de Polignac number, because 256977930309 - 2⁹ = 256977929797 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256977930329) 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, 1022044 + ... + 1248410.

It is an arithmetic number, because the mean of its divisors is an integer number (21522163968).

Almost surely, 2^256977930309 is an apocalyptic number.

It is an amenable number.

256977930309 is a deficient number, since it is larger than the sum of its proper divisors (87376693179).

256977930309 is a wasteful number, since it uses less digits than its factorization.

256977930309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228264.

The product of its (nonzero) digits is 19289340, while the sum is 60.

The spelling of 256977930309 in words is "two hundred fifty-six billion, nine hundred seventy-seven million, nine hundred thirty thousand, three hundred nine".