256507036123 has 16 divisors (see below), whose sum is σ = 278805814560. Its totient is φ = 234576889344.

The previous prime is 256507036063. The next prime is 256507036141. The reversal of 256507036123 is 321630705652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256507036123 is a prime.

It is a super-2 number, since 2×256507036123² (a number of 24 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (256507036153) 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, 3398665 + ... + 3473317.

It is an arithmetic number, because the mean of its divisors is an integer number (17425363410).

Almost surely, 2^256507036123 is an apocalyptic number.

256507036123 is a deficient number, since it is larger than the sum of its proper divisors (22298778437).

256507036123 is a wasteful number, since it uses less digits than its factorization.

256507036123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77118.

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 256507036123 in words is "two hundred fifty-six billion, five hundred seven million, thirty-six thousand, one hundred twenty-three".