647686677866018 has 8 divisors (see below), whose sum is σ = 1110320019198912. Its totient is φ = 277580004799716.

The previous prime is 647686677866017. The next prime is 647686677866029. The reversal of 647686677866018 is 810668776686746.

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

It is not an unprimeable number, because it can be changed into a prime (647686677866017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23131667066630 + ... + 23131667066657.

It is an arithmetic number, because the mean of its divisors is an integer number (138790002399864).

Almost surely, 2^{647686677866018} is an apocalyptic number.

647686677866018 is a deficient number, since it is larger than the sum of its proper divisors (462633341332894).

647686677866018 is a wasteful number, since it uses less digits than its factorization.

647686677866018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46263334133296.

The product of its (nonzero) digits is 32774160384, while the sum is 86.

The spelling of 647686677866018 in words is "six hundred forty-seven trillion, six hundred eighty-six billion, six hundred seventy-seven million, eight hundred sixty-six thousand, eighteen".