51556656 has 40 divisors (see below), whose sum is σ = 136290880. Its totient is φ = 16785216.

The previous prime is 51556643. The next prime is 51556663. The reversal of 51556656 is 65665515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10426 + ... + 14553.

It is an arithmetic number, because the mean of its divisors is an integer number (3407272).

Almost surely, 2^51556656 is an apocalyptic number.

It is an amenable number.

51556656 is an abundant number, since it is smaller than the sum of its proper divisors (84734224).

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

51556656 is a wasteful number, since it uses less digits than its factorization.

51556656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25033 (or 25027 counting only the distinct ones).

The product of its digits is 135000, while the sum is 39.

The square root of 51556656 is about 7180.2963727133. The cubic root of 51556656 is about 372.1873261643.

It can be divided in two parts, 5155 and 6656, that added together give a palindrome (11811).

The spelling of 51556656 in words is "fifty-one million, five hundred fifty-six thousand, six hundred fifty-six".