256477634073 has 6 divisors (see below), whose sum is σ = 370467693674. Its totient is φ = 170985089376.

The previous prime is 256477634069. The next prime is 256477634111. The reversal of 256477634073 is 370436774652.

256477634073 is a `hidden beast` number, since 2 + 5 + 6 + 477 + 63 + 40 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 251013024144 + 5464609929 = 501012^2 + 73923^2 .

It is not a de Polignac number, because 256477634073 - 2² = 256477634069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256477834073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14248757440 + ... + 14248757457.

Almost surely, 2^256477634073 is an apocalyptic number.

It is an amenable number.

256477634073 is a deficient number, since it is larger than the sum of its proper divisors (113990059601).

256477634073 is a wasteful number, since it uses less digits than its factorization.

256477634073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28497514903 (or 28497514900 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 54.

The spelling of 256477634073 in words is "two hundred fifty-six billion, four hundred seventy-seven million, six hundred thirty-four thousand, seventy-three".