51656566 has 16 divisors (see below), whose sum is σ = 83813184. Its totient is φ = 23736384.

The previous prime is 51656543. The next prime is 51656593. The reversal of 51656566 is 66565615.

It is a congruent number.

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, 1795 + ... + 10321.

It is an arithmetic number, because the mean of its divisors is an integer number (5238324).

Almost surely, 2^51656566 is an apocalyptic number.

51656566 is a deficient number, since it is larger than the sum of its proper divisors (32156618).

51656566 is a wasteful number, since it uses less digits than its factorization.

51656566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8775.

The product of its digits is 162000, while the sum is 40.

The square root of 51656566 is about 7187.2502391387. The cubic root of 51656566 is about 372.4275876840.

The spelling of 51656566 in words is "fifty-one million, six hundred fifty-six thousand, five hundred sixty-six".