51566666364 has 24 divisors (see below), whose sum is σ = 133691357520. Its totient is φ = 17188888752.

The previous prime is 51566666317. The next prime is 51566666383. The reversal of 51566666364 is 46366666515.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 51566666364.

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, 238734459 + ... + 238734674.

It is an arithmetic number, because the mean of its divisors is an integer number (5570473230).

Almost surely, 2^51566666364 is an apocalyptic number.

51566666364 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51566666364 is an abundant number, since it is smaller than the sum of its proper divisors (82124691156).

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

51566666364 is a wasteful number, since it uses less digits than its factorization.

51566666364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477469146 (or 477469138 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 54.

The spelling of 51566666364 in words is "fifty-one billion, five hundred sixty-six million, six hundred sixty-six thousand, three hundred sixty-four".