256723837553 has 24 divisors (see below), whose sum is σ = 273799595520. Its totient is φ = 240662096640.

The previous prime is 256723837549. The next prime is 256723837583. The reversal of 256723837553 is 355738327652.

It is not a de Polignac number, because 256723837553 - 2² = 256723837549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256723837583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158568578 + ... + 158570196.

It is an arithmetic number, because the mean of its divisors is an integer number (11408316480).

Almost surely, 2^256723837553 is an apocalyptic number.

It is an amenable number.

256723837553 is a deficient number, since it is larger than the sum of its proper divisors (17075757967).

256723837553 is a wasteful number, since it uses less digits than its factorization.

256723837553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497 (or 3480 counting only the distinct ones).

The product of its digits is 31752000, while the sum is 56.

The spelling of 256723837553 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred thirty-seven thousand, five hundred fifty-three".