256051565553 has 64 divisors (see below), whose sum is σ = 421270784000. Its totient is φ = 135065387520.

The previous prime is 256051565527. The next prime is 256051565563. The reversal of 256051565553 is 355565150652.

It is a happy number.

It is not a de Polignac number, because 256051565553 - 2¹² = 256051561457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256051565513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7205373 + ... + 7240821.

It is an arithmetic number, because the mean of its divisors is an integer number (6582356000).

Almost surely, 2^256051565553 is an apocalyptic number.

It is an amenable number.

256051565553 is a deficient number, since it is larger than the sum of its proper divisors (165219218447).

256051565553 is a wasteful number, since it uses less digits than its factorization.

256051565553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35942.

The product of its (nonzero) digits is 3375000, while the sum is 48.

The spelling of 256051565553 in words is "two hundred fifty-six billion, fifty-one million, five hundred sixty-five thousand, five hundred fifty-three".