256220606455 has 16 divisors (see below), whose sum is σ = 342552582144. Its totient is φ = 182377528480.

The previous prime is 256220606431. The next prime is 256220606459. The reversal of 256220606455 is 554606022652.

It is not a de Polignac number, because 256220606455 - 2¹⁷ = 256220475383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256220606459) 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, 49556527 + ... + 49561696.

It is an arithmetic number, because the mean of its divisors is an integer number (21409536384).

Almost surely, 2^256220606455 is an apocalyptic number.

256220606455 is a deficient number, since it is larger than the sum of its proper divisors (86331975689).

256220606455 is a wasteful number, since it uses less digits than its factorization.

256220606455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99118286.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 256220606455 in words is "two hundred fifty-six billion, two hundred twenty million, six hundred six thousand, four hundred fifty-five".