681166072 has 16 divisors (see below), whose sum is σ = 1277490240. Its totient is φ = 340502016.

The previous prime is 681166051. The next prime is 681166111. The reversal of 681166072 is 270661186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40473 + ... + 54775.

It is an arithmetic number, because the mean of its divisors is an integer number (79843140).

Almost surely, 2^681166072 is an apocalyptic number.

It is an amenable number.

681166072 is a deficient number, since it is larger than the sum of its proper divisors (596324168).

681166072 is a wasteful number, since it uses less digits than its factorization.

681166072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20262 (or 20258 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 681166072 is about 26099.1584538659. The cubic root of 681166072 is about 879.8682964055.

It can be divided in two parts, 681 and 166072, that added together give a triangular number (166753 = T₅₇₇).

The spelling of 681166072 in words is "six hundred eighty-one million, one hundred sixty-six thousand, seventy-two".