667651636686 has 8 divisors (see below), whose sum is σ = 1335303273384. Its totient is φ = 222550545560.

The previous prime is 667651636651. The next prime is 667651636697. The reversal of 667651636686 is 686636156766.

It is a sphenic number, since it is the product of 3 distinct primes.

667651636686 is an admirable number.

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, 55637636385 + ... + 55637636396.

It is an arithmetic number, because the mean of its divisors is an integer number (166912909173).

Almost surely, 2^667651636686 is an apocalyptic number.

667651636686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

667651636686 is a wasteful number, since it uses less digits than its factorization.

667651636686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111275272786.

The product of its digits is 235146240, while the sum is 66.

The spelling of 667651636686 in words is "six hundred sixty-seven billion, six hundred fifty-one million, six hundred thirty-six thousand, six hundred eighty-six".