666971952 has 20 divisors (see below), whose sum is σ = 1723011000. Its totient is φ = 222323968.

The previous prime is 666971927. The next prime is 666972001. The reversal of 666971952 is 259179666.

It is a junction number, because it is equal to n+sod(n) for n = 666971895 and 666971904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6947577 + ... + 6947672.

It is an arithmetic number, because the mean of its divisors is an integer number (86150550).

Almost surely, 2^666971952 is an apocalyptic number.

It is an amenable number.

666971952 is an abundant number, since it is smaller than the sum of its proper divisors (1056039048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666971952 is a wasteful number, since it uses less digits than its factorization.

666971952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13895260 (or 13895254 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 51.

The square root of 666971952 is about 25825.8001231327. The cubic root of 666971952 is about 873.7137900389.

The spelling of 666971952 in words is "six hundred sixty-six million, nine hundred seventy-one thousand, nine hundred fifty-two".