686387337816 has 32 divisors (see below), whose sum is σ = 1716085542960. Its totient is φ = 228780152832.

The previous prime is 686387337799. The next prime is 686387337827. The reversal of 686387337816 is 618733783686.

It is a super-2 number, since 2×686387337816² (a number of 24 digits) contains 22 as substring.

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, 615205 + ... + 1323348.

Almost surely, 2^686387337816 is an apocalyptic number.

It is an amenable number.

686387337816 is an abundant number, since it is smaller than the sum of its proper divisors (1029698205144).

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

686387337816 is a wasteful number, since it uses less digits than its factorization.

686387337816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953315 (or 1953311 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 66.

The spelling of 686387337816 in words is "six hundred eighty-six billion, three hundred eighty-seven million, three hundred thirty-seven thousand, eight hundred sixteen".