686949815308 has 6 divisors (see below), whose sum is σ = 1202162176796. Its totient is φ = 343474907652.

The previous prime is 686949815287. The next prime is 686949815309. The reversal of 686949815308 is 803518949686.

686949815308 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686949815308² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686949815309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85868726910 + ... + 85868726917.

Almost surely, 2^686949815308 is an apocalyptic number.

It is an amenable number.

686949815308 is a deficient number, since it is larger than the sum of its proper divisors (515212361488).

686949815308 is a wasteful number, since it uses less digits than its factorization.

686949815308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171737453831 (or 171737453829 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 67.

The spelling of 686949815308 in words is "six hundred eighty-six billion, nine hundred forty-nine million, eight hundred fifteen thousand, three hundred eight".