667544975 has 6 divisors (see below), whose sum is σ = 827755800. Its totient is φ = 534035960.

The previous prime is 667544963. The next prime is 667544981. The reversal of 667544975 is 579445766.

It is not a de Polignac number, because 667544975 - 2⁸ = 667544719 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13350875 + ... + 13350924.

It is an arithmetic number, because the mean of its divisors is an integer number (137959300).

Almost surely, 2^667544975 is an apocalyptic number.

667544975 is a deficient number, since it is larger than the sum of its proper divisors (160210825).

667544975 is a wasteful number, since it uses less digits than its factorization.

667544975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26701809 (or 26701804 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 53.

The square root of 667544975 is about 25836.8917441708. The cubic root of 667544975 is about 873.9639328849.

The spelling of 667544975 in words is "six hundred sixty-seven million, five hundred forty-four thousand, nine hundred seventy-five".