51666166500 has 96 divisors (see below), whose sum is σ = 162025159296. Its totient is φ = 12717820800.

The previous prime is 51666166477. The next prime is 51666166547. The reversal of 51666166500 is 566166615.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1305274 + ... + 1344273.

It is an arithmetic number, because the mean of its divisors is an integer number (1687762076).

Almost surely, 2^51666166500 is an apocalyptic number.

51666166500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51666166500 is an abundant number, since it is smaller than the sum of its proper divisors (110358992796).

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

51666166500 is a wasteful number, since it uses less digits than its factorization.

51666166500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649582 (or 2649570 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 51666166500 in words is "fifty-one billion, six hundred sixty-six million, one hundred sixty-six thousand, five hundred".