686600691 has 12 divisors (see below), whose sum is σ = 1064931912. Its totient is φ = 392343168.

The previous prime is 686600683. The next prime is 686600693. The reversal of 686600691 is 196006686.

It is not a de Polignac number, because 686600691 - 2³ = 686600683 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (686600693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2335230 + ... + 2335523.

It is an arithmetic number, because the mean of its divisors is an integer number (88744326).

Almost surely, 2^686600691 is an apocalyptic number.

686600691 is a deficient number, since it is larger than the sum of its proper divisors (378331221).

686600691 is a wasteful number, since it uses less digits than its factorization.

686600691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670770 (or 4670763 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 686600691 is about 26203.0664426895. The cubic root of 686600691 is about 882.2020826953.

The spelling of 686600691 in words is "six hundred eighty-six million, six hundred thousand, six hundred ninety-one".