667517985 has 24 divisors (see below), whose sum is σ = 1174305600. Its totient is φ = 350694432.

The previous prime is 667517959. The next prime is 667517993. The reversal of 667517985 is 589715766.

It is not a de Polignac number, because 667517985 - 2²⁰ = 666469409 is a prime.

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, 107685 + ... + 113714.

It is an arithmetic number, because the mean of its divisors is an integer number (48929400).

Almost surely, 2^667517985 is an apocalyptic number.

It is an amenable number.

667517985 is a deficient number, since it is larger than the sum of its proper divisors (506787615).

667517985 is a wasteful number, since it uses less digits than its factorization.

667517985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221477 (or 221474 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The square root of 667517985 is about 25836.3694237406. The cubic root of 667517985 is about 873.9521541008.

The spelling of 667517985 in words is "six hundred sixty-seven million, five hundred seventeen thousand, nine hundred eighty-five".