256334625643 has 4 divisors (see below), whose sum is σ = 256397564808. Its totient is φ = 256271686480.

The previous prime is 256334625623. The next prime is 256334625661. The reversal of 256334625643 is 346526433652.

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 256334625643 - 2¹⁷ = 256334494571 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256334625623) 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, 31463473 + ... + 31471618.

It is an arithmetic number, because the mean of its divisors is an integer number (64099391202).

Almost surely, 2^256334625643 is an apocalyptic number.

256334625643 is a deficient number, since it is larger than the sum of its proper divisors (62939165).

256334625643 is an equidigital number, since it uses as much as digits as its factorization.

256334625643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62939164.

The product of its digits is 9331200, while the sum is 49.

The spelling of 256334625643 in words is "two hundred fifty-six billion, three hundred thirty-four million, six hundred twenty-five thousand, six hundred forty-three".