256402708265 has 32 divisors (see below), whose sum is σ = 336435482880. Its totient is φ = 186041363200.

The previous prime is 256402708229. The next prime is 256402708333. The reversal of 256402708265 is 562807204652.

It is a happy number.

It is not a de Polignac number, because 256402708265 - 2¹⁸ = 256402446121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48957227 + ... + 48962463.

It is an arithmetic number, because the mean of its divisors is an integer number (10513608840).

Almost surely, 2^256402708265 is an apocalyptic number.

It is an amenable number.

256402708265 is a deficient number, since it is larger than the sum of its proper divisors (80032774615).

256402708265 is a wasteful number, since it uses less digits than its factorization.

256402708265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7153.

The product of its (nonzero) digits is 1612800, while the sum is 47.

The spelling of 256402708265 in words is "two hundred fifty-six billion, four hundred two million, seven hundred eight thousand, two hundred sixty-five".