667978252 has 6 divisors (see below), whose sum is σ = 1168961948. Its totient is φ = 333989124.

The previous prime is 667978249. The next prime is 667978253. The reversal of 667978252 is 252879766.

It is a self number, because there is not a number n which added to its sum of digits gives 667978252.

It is not an unprimeable number, because it can be changed into a prime (667978253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83497278 + ... + 83497285.

Almost surely, 2^667978252 is an apocalyptic number.

It is an amenable number.

667978252 is a deficient number, since it is larger than the sum of its proper divisors (500983696).

667978252 is a wasteful number, since it uses less digits than its factorization.

667978252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166994567 (or 166994565 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 52.

The square root of 667978252 is about 25845.2752355242. The cubic root of 667978252 is about 874.1529771134.

The spelling of 667978252 in words is "six hundred sixty-seven million, nine hundred seventy-eight thousand, two hundred fifty-two".