686716556 has 12 divisors (see below), whose sum is σ = 1202788440. Its totient is φ = 343062720.

The previous prime is 686716529. The next prime is 686716561. The reversal of 686716556 is 655617686.

It is a super-2 number, since 2×686716556² = 943159256569002272, which contains 22 as substring.

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, 68621 + ... + 77988.

It is an arithmetic number, because the mean of its divisors is an integer number (100232370).

Almost surely, 2^686716556 is an apocalyptic number.

It is an amenable number.

686716556 is a deficient number, since it is larger than the sum of its proper divisors (516071884).

686716556 is a wasteful number, since it uses less digits than its factorization.

686716556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147784 (or 147782 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 50.

The square root of 686716556 is about 26205.2772547821. The cubic root of 686716556 is about 882.2517042567.

The spelling of 686716556 in words is "six hundred eighty-six million, seven hundred sixteen thousand, five hundred fifty-six".