51164642660 has 24 divisors (see below), whose sum is σ = 110349690360. Its totient is φ = 19912725504.

The previous prime is 51164642629. The next prime is 51164642677. The reversal of 51164642660 is 6624646115.

It can be written as a sum of positive squares in 4 ways, for example, as 10648588864 + 40516053796 = 103192^2 + 201286^2 .

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, 34569965 + ... + 34571444.

It is an arithmetic number, because the mean of its divisors is an integer number (4597903765).

Almost surely, 2^51164642660 is an apocalyptic number.

It is an amenable number.

51164642660 is an abundant number, since it is smaller than the sum of its proper divisors (59185047700).

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

51164642660 is a wasteful number, since it uses less digits than its factorization.

51164642660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69141455 (or 69141453 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 51164642660 in words is "fifty-one billion, one hundred sixty-four million, six hundred forty-two thousand, six hundred sixty".