667172812 has 6 divisors (see below), whose sum is σ = 1167552428. Its totient is φ = 333586404.

The previous prime is 667172797. The next prime is 667172833. The reversal of 667172812 is 218271766.

It is a super-2 number, since 2×667172812² = 890239122143974688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83396598 + ... + 83396605.

Almost surely, 2^667172812 is an apocalyptic number.

It is an amenable number.

667172812 is a deficient number, since it is larger than the sum of its proper divisors (500379616).

667172812 is a wasteful number, since it uses less digits than its factorization.

667172812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166793207 (or 166793205 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 667172812 is about 25829.6885772942. The cubic root of 667172812 is about 873.8014881485.

The spelling of 667172812 in words is "six hundred sixty-seven million, one hundred seventy-two thousand, eight hundred twelve".