686618648556 has 24 divisors (see below), whose sum is σ = 1696351955760. Its totient is φ = 215409772032.

The previous prime is 686618648549. The next prime is 686618648563. The reversal of 686618648556 is 655846816686.

It is an interprime number because it is at equal distance from previous prime (686618648549) and next prime (686618648563).

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, 1682888641 + ... + 1682889048.

It is an arithmetic number, because the mean of its divisors is an integer number (70681331490).

Almost surely, 2^686618648556 is an apocalyptic number.

It is an amenable number.

686618648556 is an abundant number, since it is smaller than the sum of its proper divisors (1009733307204).

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

686618648556 is a wasteful number, since it uses less digits than its factorization.

686618648556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365777713 (or 3365777711 counting only the distinct ones).

The product of its digits is 398131200, while the sum is 69.

The spelling of 686618648556 in words is "six hundred eighty-six billion, six hundred eighteen million, six hundred forty-eight thousand, five hundred fifty-six".