51364566 has 48 divisors (see below), whose sum is σ = 126696960. Its totient is φ = 14886960.

The previous prime is 51364549. The next prime is 51364567. The reversal of 51364566 is 66546315.

51364566 is a `hidden beast` number, since 5 + 1 + 3 + 645 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51364566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51364567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1086 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (2639520).

Almost surely, 2^51364566 is an apocalyptic number.

51364566 is an abundant number, since it is smaller than the sum of its proper divisors (75332394).

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

51364566 is a wasteful number, since it uses less digits than its factorization.

51364566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11321 (or 11318 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 51364566 is about 7166.9077013730. The cubic root of 51364566 is about 371.7245185562.

It can be divided in two parts, 5136 and 4566, that multiplied together give a triangular number (23450976 = T₆₈₄₈).

The spelling of 51364566 in words is "fifty-one million, three hundred sixty-four thousand, five hundred sixty-six".