256477067525431 has 4 divisors (see below), whose sum is σ = 260824136466600. Its totient is φ = 252129998584264.

The previous prime is 256477067525423. The next prime is 256477067525449. The reversal of 256477067525431 is 134525760774652.

256477067525431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256477067525431 - 2³ = 256477067525423 is a prime.

It is a super-2 number, since 2×256477067525431² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256477067525491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2173534470496 + ... + 2173534470613.

It is an arithmetic number, because the mean of its divisors is an integer number (65206034116650).

Almost surely, 2^{256477067525431} is an apocalyptic number.

256477067525431 is a deficient number, since it is larger than the sum of its proper divisors (4347068941169).

256477067525431 is an equidigital number, since it uses as much as digits as its factorization.

256477067525431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4347068941168.

The product of its (nonzero) digits is 296352000, while the sum is 64.

The spelling of 256477067525431 in words is "two hundred fifty-six trillion, four hundred seventy-seven billion, sixty-seven million, five hundred twenty-five thousand, four hundred thirty-one".