256723837503 has 32 divisors (see below), whose sum is σ = 403969474560. Its totient is φ = 141913680480.

The previous prime is 256723837459. The next prime is 256723837511. The reversal of 256723837503 is 305738327652.

It is not a de Polignac number, because 256723837503 - 2²¹ = 256721740351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256723837583) 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, 1689418 + ... + 1835096.

It is an arithmetic number, because the mean of its divisors is an integer number (12624046080).

Almost surely, 2^256723837503 is an apocalyptic number.

256723837503 is a deficient number, since it is larger than the sum of its proper divisors (147245637057).

256723837503 is a wasteful number, since it uses less digits than its factorization.

256723837503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148427.

The product of its (nonzero) digits is 6350400, while the sum is 51.

The spelling of 256723837503 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred thirty-seven thousand, five hundred three".