256464807455 has 16 divisors (see below), whose sum is σ = 317843330304. Its totient is φ = 198454717440.

The previous prime is 256464807451. The next prime is 256464807463. The reversal of 256464807455 is 554708464652.

It is not a de Polignac number, because 256464807455 - 2² = 256464807451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256464807455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256464807451) 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, 97532 + ... + 722801.

It is an arithmetic number, because the mean of its divisors is an integer number (19865208144).

Almost surely, 2^256464807455 is an apocalyptic number.

256464807455 is a deficient number, since it is larger than the sum of its proper divisors (61378522849).

256464807455 is a wasteful number, since it uses less digits than its factorization.

256464807455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822386.

The product of its (nonzero) digits is 32256000, while the sum is 56.

The spelling of 256464807455 in words is "two hundred fifty-six billion, four hundred sixty-four million, eight hundred seven thousand, four hundred fifty-five".