51666668520 has 32 divisors (see below), whose sum is σ = 155000005920. Its totient is φ = 13777778240.

The previous prime is 51666668483. The next prime is 51666668561. The reversal of 51666668520 is 2586666615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215277666 + ... + 215277905.

It is an arithmetic number, because the mean of its divisors is an integer number (4843750185).

Almost surely, 2^51666668520 is an apocalyptic number.

It is an amenable number.

51666668520 is an abundant number, since it is smaller than the sum of its proper divisors (103333337400).

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

51666668520 is a wasteful number, since it uses less digits than its factorization.

51666668520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430555585 (or 430555581 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 51666668520 in words is "fifty-one billion, six hundred sixty-six million, six hundred sixty-eight thousand, five hundred twenty".