256437544136 has 16 divisors (see below), whose sum is σ = 480826369500. Its totient is φ = 128217178944.

The previous prime is 256437544109. The next prime is 256437544171. The reversal of 256437544136 is 631445734652.

It can be written as a sum of positive squares in 2 ways, for example, as 242723728900 + 13713815236 = 492670^2 + 117106^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752426 + ... + 1038758.

Almost surely, 2^256437544136 is an apocalyptic number.

It is an amenable number.

256437544136 is a deficient number, since it is larger than the sum of its proper divisors (224388825364).

256437544136 is a wasteful number, since it uses less digits than its factorization.

256437544136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398288 (or 398284 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 50.

The spelling of 256437544136 in words is "two hundred fifty-six billion, four hundred thirty-seven million, five hundred forty-four thousand, one hundred thirty-six".