686686424680 has 16 divisors (see below), whose sum is σ = 1545044455620. Its totient is φ = 274674569856.

The previous prime is 686686424663. The next prime is 686686424681. The reversal of 686686424680 is 86424686686.

It can be written as a sum of positive squares in 2 ways, for example, as 611721079876 + 74965344804 = 782126^2 + 273798^2 .

It is not an unprimeable number, because it can be changed into a prime (686686424681) 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, 8583580269 + ... + 8583580348.

Almost surely, 2^686686424680 is an apocalyptic number.

It is an amenable number.

686686424680 is an abundant number, since it is smaller than the sum of its proper divisors (858358030940).

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

686686424680 is a wasteful number, since it uses less digits than its factorization.

686686424680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17167160628 (or 17167160624 counting only the distinct ones).

The product of its (nonzero) digits is 127401984, while the sum is 64.

The spelling of 686686424680 in words is "six hundred eighty-six billion, six hundred eighty-six million, four hundred twenty-four thousand, six hundred eighty".