256734145452631 has 16 divisors (see below), whose sum is σ = 320084494253568. Its totient is φ = 200052352836000.

The previous prime is 256734145452619. The next prime is 256734145452679. The reversal of 256734145452631 is 136254541437652.

It is not a de Polignac number, because 256734145452631 - 2³⁹ = 256184389638743 is a prime.

It is a super-2 number, since 2×256734145452631² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256734145492631) 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, 104588806 + ... + 107015356.

It is an arithmetic number, because the mean of its divisors is an integer number (20005280890848).

Almost surely, 2^{256734145452631} is an apocalyptic number.

256734145452631 is a deficient number, since it is larger than the sum of its proper divisors (63350348800937).

256734145452631 is a wasteful number, since it uses less digits than its factorization.

256734145452631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800622.

The product of its digits is 72576000, while the sum is 58.

The spelling of 256734145452631 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, one hundred forty-five million, four hundred fifty-two thousand, six hundred thirty-one".