666879345 has 32 divisors (see below), whose sum is σ = 1293344640. Its totient is φ = 323334720.

The previous prime is 666879329. The next prime is 666879359. The reversal of 666879345 is 543978666.

It is not a de Polignac number, because 666879345 - 2⁴ = 666879329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666879291 and 666879300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223054 + ... + 226023.

It is an arithmetic number, because the mean of its divisors is an integer number (40417020).

Almost surely, 2^666879345 is an apocalyptic number.

It is an amenable number.

666879345 is a deficient number, since it is larger than the sum of its proper divisors (626465295).

666879345 is a wasteful number, since it uses less digits than its factorization.

666879345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449102 (or 449096 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 666879345 is about 25824.0071445157. The cubic root of 666879345 is about 873.6733506782.

The spelling of 666879345 in words is "six hundred sixty-six million, eight hundred seventy-nine thousand, three hundred forty-five".