666634955 has 24 divisors (see below), whose sum is σ = 936333072. Its totient is φ = 454289472.

The previous prime is 666634937. The next prime is 666634963. The reversal of 666634955 is 559436666.

It is not a de Polignac number, because 666634955 - 2¹⁴ = 666618571 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31589 + ... + 48281.

It is an arithmetic number, because the mean of its divisors is an integer number (39013878).

Almost surely, 2^666634955 is an apocalyptic number.

666634955 is a deficient number, since it is larger than the sum of its proper divisors (269698117).

666634955 is a wasteful number, since it uses less digits than its factorization.

666634955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16875 (or 16868 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 50.

The square root of 666634955 is about 25819.2748736288. The cubic root of 666634955 is about 873.5666131704.

The spelling of 666634955 in words is "six hundred sixty-six million, six hundred thirty-four thousand, nine hundred fifty-five".