51656557 has 8 divisors (see below), whose sum is σ = 54758592. Its totient is φ = 48561600.

The previous prime is 51656543. The next prime is 51656593. The reversal of 51656557 is 75565615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51656557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24682 + ... + 26692.

It is an arithmetic number, because the mean of its divisors is an integer number (6844824).

Almost surely, 2^51656557 is an apocalyptic number.

It is an amenable number.

51656557 is a deficient number, since it is larger than the sum of its proper divisors (3102035).

51656557 is a wasteful number, since it uses less digits than its factorization.

51656557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539.

The product of its digits is 157500, while the sum is 40.

The square root of 51656557 is about 7187.2496130300. The cubic root of 51656557 is about 372.4275660549.

The spelling of 51656557 in words is "fifty-one million, six hundred fifty-six thousand, five hundred fifty-seven".