1680918618 has 16 divisors (see below), whose sum is σ = 3391589376. Its totient is φ = 555347520.

The previous prime is 1680918599. The next prime is 1680918661. The reversal of 1680918618 is 8168190861.

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, 1238938 + ... + 1240293.

It is an arithmetic number, because the mean of its divisors is an integer number (211974336).

Almost surely, 2^1680918618 is an apocalyptic number.

1680918618 is an abundant number, since it is smaller than the sum of its proper divisors (1710670758).

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

1680918618 is a wasteful number, since it uses less digits than its factorization.

1680918618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479349.

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 1680918618 is about 40999.0075245731. The cubic root of 1680918618 is about 1189.0010254254.

The spelling of 1680918618 in words is "one billion, six hundred eighty million, nine hundred eighteen thousand, six hundred eighteen".