256723837494 has 16 divisors (see below), whose sum is σ = 535771487232. Its totient is φ = 81853977128.

The previous prime is 256723837459. The next prime is 256723837511. The reversal of 256723837494 is 494738327652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 930158694 + ... + 930158969.

It is an arithmetic number, because the mean of its divisors is an integer number (33485717952).

Almost surely, 2^256723837494 is an apocalyptic number.

256723837494 is an abundant number, since it is smaller than the sum of its proper divisors (279047649738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256723837494 is a wasteful number, since it uses less digits than its factorization.

256723837494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860317691.

The product of its digits is 60963840, while the sum is 60.

The spelling of 256723837494 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred thirty-seven thousand, four hundred ninety-four".