686316066 has 16 divisors (see below), whose sum is σ = 1373433600. Its totient is φ = 228638448.

The previous prime is 686316023. The next prime is 686316073. The reversal of 686316066 is 660613686.

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, 21961 + ... + 43068.

It is an arithmetic number, because the mean of its divisors is an integer number (85839600).

Almost surely, 2^686316066 is an apocalyptic number.

686316066 is an abundant number, since it is smaller than the sum of its proper divisors (687117534).

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

686316066 is a wasteful number, since it uses less digits than its factorization.

686316066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66793.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 686316066 is about 26197.6347405639. The cubic root of 686316066 is about 882.0801624993.

The spelling of 686316066 in words is "six hundred eighty-six million, three hundred sixteen thousand, sixty-six".