256278872651 has 16 divisors (see below), whose sum is σ = 279383670720. Its totient is φ = 234125982720.

The previous prime is 256278872639. The next prime is 256278872653. The reversal of 256278872651 is 156278872652.

It is a cyclic number.

It is not a de Polignac number, because 256278872651 - 2²² = 256274678347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256278872653) 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, 795911 + ... + 1070528.

It is an arithmetic number, because the mean of its divisors is an integer number (17461479420).

Almost surely, 2^256278872651 is an apocalyptic number.

256278872651 is a deficient number, since it is larger than the sum of its proper divisors (23104798069).

256278872651 is a wasteful number, since it uses less digits than its factorization.

256278872651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866694.

The product of its digits is 22579200, while the sum is 59.

Subtracting from 256278872651 its reverse (156278872652), we obtain a palindrome (99999999999).

The spelling of 256278872651 in words is "two hundred fifty-six billion, two hundred seventy-eight million, eight hundred seventy-two thousand, six hundred fifty-one".