51656568 has 16 divisors (see below), whose sum is σ = 129141480. Its totient is φ = 17218848.

The previous prime is 51656543. The next prime is 51656593. The reversal of 51656568 is 86565615.

51656568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51656543) and next prime (51656593).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076155 + ... + 1076202.

Almost surely, 2^51656568 is an apocalyptic number.

It is an amenable number.

51656568 is an abundant number, since it is smaller than the sum of its proper divisors (77484912).

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

51656568 is a wasteful number, since it uses less digits than its factorization.

51656568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152366 (or 2152362 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

The square root of 51656568 is about 7187.2503782740. The cubic root of 51656568 is about 372.4275924904.

The spelling of 51656568 in words is "fifty-one million, six hundred fifty-six thousand, five hundred sixty-eight".