666927331 has 16 divisors (see below), whose sum is σ = 785998080. Its totient is φ = 553932000.

The previous prime is 666927319. The next prime is 666927409. The reversal of 666927331 is 133729666.

It is a cyclic number.

It is not a de Polignac number, because 666927331 - 2²⁵ = 633372899 is a prime.

It is a super-2 number, since 2×666927331² = 889584129669567122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666927301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59880 + ... + 70138.

It is an arithmetic number, because the mean of its divisors is an integer number (49124880).

Almost surely, 2^666927331 is an apocalyptic number.

666927331 is a deficient number, since it is larger than the sum of its proper divisors (119070749).

666927331 is a wasteful number, since it uses less digits than its factorization.

666927331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10554.

The product of its digits is 244944, while the sum is 43.

The square root of 666927331 is about 25824.9362245098. The cubic root of 666927331 is about 873.6943055352.

The spelling of 666927331 in words is "six hundred sixty-six million, nine hundred twenty-seven thousand, three hundred thirty-one".