667647337656 has 32 divisors (see below), whose sum is σ = 1797512063760. Its totient is φ = 205429949952.

The previous prime is 667647337601. The next prime is 667647337699. The reversal of 667647337656 is 656733746766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1069947345 + ... + 1069947968.

Almost surely, 2^667647337656 is an apocalyptic number.

It is an amenable number.

667647337656 is an abundant number, since it is smaller than the sum of its proper divisors (1129864726104).

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

667647337656 is a wasteful number, since it uses less digits than its factorization.

667647337656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139895335 (or 2139895331 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 66.

The spelling of 667647337656 in words is "six hundred sixty-seven billion, six hundred forty-seven million, three hundred thirty-seven thousand, six hundred fifty-six".