666409823372 has 24 divisors (see below), whose sum is σ = 1169041566000. Its totient is φ = 332398506240.

The previous prime is 666409823341. The next prime is 666409823393. The reversal of 666409823372 is 273328904666.

666409823372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 4803848 + ... + 4940624.

It is an arithmetic number, because the mean of its divisors is an integer number (48710065250).

Almost surely, 2^666409823372 is an apocalyptic number.

It is an amenable number.

666409823372 is a deficient number, since it is larger than the sum of its proper divisors (502631742628).

666409823372 is a wasteful number, since it uses less digits than its factorization.

666409823372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139721 (or 139719 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 666409823372 in words is "six hundred sixty-six billion, four hundred nine million, eight hundred twenty-three thousand, three hundred seventy-two".