680616618 has 16 divisors (see below), whose sum is σ = 1484981856. Its totient is φ = 206247440.

The previous prime is 680616617. The next prime is 680616637. The reversal of 680616618 is 816616086.

It is a self number, because there is not a number n which added to its sum of digits gives 680616618.

It is not an unprimeable number, because it can be changed into a prime (680616617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5156121 + ... + 5156252.

It is an arithmetic number, because the mean of its divisors is an integer number (92811366).

Almost surely, 2^680616618 is an apocalyptic number.

680616618 is an abundant number, since it is smaller than the sum of its proper divisors (804365238).

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

680616618 is a wasteful number, since it uses less digits than its factorization.

680616618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312389.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 680616618 is about 26088.6300521894. The cubic root of 680616618 is about 879.6316545537.

The spelling of 680616618 in words is "six hundred eighty million, six hundred sixteen thousand, six hundred eighteen".