667217179992 has 64 divisors (see below), whose sum is σ = 1820330755200. Its totient is φ = 202115075840.

The previous prime is 667217179949. The next prime is 667217180033. The reversal of 667217179992 is 299971712766.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295948 + ... + 1192484.

It is an arithmetic number, because the mean of its divisors is an integer number (28442668050).

Almost surely, 2^667217179992 is an apocalyptic number.

It is an amenable number.

667217179992 is an abundant number, since it is smaller than the sum of its proper divisors (1153113575208).

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

667217179992 is a wasteful number, since it uses less digits than its factorization.

667217179992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899376 (or 899372 counting only the distinct ones).

The product of its digits is 36006768, while the sum is 66.

The spelling of 667217179992 in words is "six hundred sixty-seven billion, two hundred seventeen million, one hundred seventy-nine thousand, nine hundred ninety-two".