666380275 has 18 divisors (see below), whose sum is σ = 908263916. Its totient is φ = 484638000.

The previous prime is 666380269. The next prime is 666380327. The reversal of 666380275 is 572083666.

It is not a de Polignac number, because 666380275 - 2⁵ = 666380243 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 107121 + ... + 113170.

Almost surely, 2^666380275 is an apocalyptic number.

666380275 is a deficient number, since it is larger than the sum of its proper divisors (241883641).

666380275 is a wasteful number, since it uses less digits than its factorization.

666380275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220323 (or 220307 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 666380275 is about 25814.3424281929. The cubic root of 666380275 is about 873.4553537366.

The spelling of 666380275 in words is "six hundred sixty-six million, three hundred eighty thousand, two hundred seventy-five".