57181868660 has 24 divisors (see below), whose sum is σ = 137236485120. Its totient is φ = 19605212064.

The previous prime is 57181868621. The next prime is 57181868677. The reversal of 57181868660 is 6686818175.

It is a happy number.

It is a super-2 number, since 2×57181868660² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 57181868596 and 57181868605.

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, 204220820 + ... + 204221099.

It is an arithmetic number, because the mean of its divisors is an integer number (5718186880).

Almost surely, 2^57181868660 is an apocalyptic number.

It is an amenable number.

57181868660 is an abundant number, since it is smaller than the sum of its proper divisors (80054616460).

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

57181868660 is a wasteful number, since it uses less digits than its factorization.

57181868660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408441935 (or 408441933 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 56.

The spelling of 57181868660 in words is "fifty-seven billion, one hundred eighty-one million, eight hundred sixty-eight thousand, six hundred sixty".