680731117181666 has 16 divisors (see below), whose sum is σ = 1021404835605240. Its totient is φ = 340262854081920.

The previous prime is 680731117181627. The next prime is 680731117181683. The reversal of 680731117181666 is 666181711137086.

680731117181666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 487483168318441 + 193247948863225 = 22079021^2 + 13901365^2 .

It is a junction number, because it is equal to n+sod(n) for n = 680731117181599 and 680731117181608.

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, 84504656 + ... + 92208996.

Almost surely, 2^{680731117181666} is an apocalyptic number.

680731117181666 is a deficient number, since it is larger than the sum of its proper divisors (340673718423574).

680731117181666 is a wasteful number, since it uses less digits than its factorization.

680731117181666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7717669.

The product of its (nonzero) digits is 12192768, while the sum is 62.

The spelling of 680731117181666 in words is "six hundred eighty trillion, seven hundred thirty-one billion, one hundred seventeen million, one hundred eighty-one thousand, six hundred sixty-six".