256651374836 has 12 divisors (see below), whose sum is σ = 449821458240. Its totient is φ = 128130958200.

The previous prime is 256651374823. The next prime is 256651374839. The reversal of 256651374836 is 638473156652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256651374839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48679340 + ... + 48684611.

It is an arithmetic number, because the mean of its divisors is an integer number (37485121520).

Almost surely, 2^256651374836 is an apocalyptic number.

It is an amenable number.

256651374836 is a deficient number, since it is larger than the sum of its proper divisors (193170083404).

256651374836 is a wasteful number, since it uses less digits than its factorization.

256651374836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97364614 (or 97364612 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 56.

The spelling of 256651374836 in words is "two hundred fifty-six billion, six hundred fifty-one million, three hundred seventy-four thousand, eight hundred thirty-six".