256406862999 has 32 divisors (see below), whose sum is σ = 427043598336. Its totient is φ = 133451112960.

The previous prime is 256406862991. The next prime is 256406863039. The reversal of 256406862999 is 999268604652.

It is a happy number.

It is not a de Polignac number, because 256406862999 - 2³ = 256406862991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256406862991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11573232 + ... + 11595365.

It is an arithmetic number, because the mean of its divisors is an integer number (13345112448).

Almost surely, 2^256406862999 is an apocalyptic number.

256406862999 is a deficient number, since it is larger than the sum of its proper divisors (170636735337).

256406862999 is a wasteful number, since it uses less digits than its factorization.

256406862999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23168655.

The product of its (nonzero) digits is 100776960, while the sum is 66.

The spelling of 256406862999 in words is "two hundred fifty-six billion, four hundred six million, eight hundred sixty-two thousand, nine hundred ninety-nine".