667746646172 has 12 divisors (see below), whose sum is σ = 1190604869496. Its totient is φ = 327573826320.

The previous prime is 667746646159. The next prime is 667746646181. The reversal of 667746646172 is 271646647766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1574873954 + ... + 1574874377.

It is an arithmetic number, because the mean of its divisors is an integer number (99217072458).

Almost surely, 2^667746646172 is an apocalyptic number.

It is an amenable number.

667746646172 is a deficient number, since it is larger than the sum of its proper divisors (522858223324).

667746646172 is a wasteful number, since it uses less digits than its factorization.

667746646172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3149748388 (or 3149748386 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 62.

The spelling of 667746646172 in words is "six hundred sixty-seven billion, seven hundred forty-six million, six hundred forty-six thousand, one hundred seventy-two".