51031664166 has 64 divisors (see below), whose sum is σ = 126025804800. Its totient is φ = 13722791040.

The previous prime is 51031664137. The next prime is 51031664171. The reversal of 51031664166 is 66146613015.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 694330 + ... + 764301.

It is an arithmetic number, because the mean of its divisors is an integer number (1969153200).

Almost surely, 2^51031664166 is an apocalyptic number.

51031664166 is an abundant number, since it is smaller than the sum of its proper divisors (74994140634).

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

51031664166 is a wasteful number, since it uses less digits than its factorization.

51031664166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458674 (or 1458660 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 51031664166 in words is "fifty-one billion, thirty-one million, six hundred sixty-four thousand, one hundred sixty-six".