1680604515666 has 12 divisors (see below), whose sum is σ = 3641309783982. Its totient is φ = 560201505216.

The previous prime is 1680604515659. The next prime is 1680604515739. The reversal of 1680604515666 is 6665154060861.

It can be written as a sum of positive squares in only one way, i.e., 1509101687025 + 171502828641 = 1228455^2 + 414129^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46683458751 + ... + 46683458786.

Almost surely, 2^{1680604515666} is an apocalyptic number.

1680604515666 is an abundant number, since it is smaller than the sum of its proper divisors (1960705268316).

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

1680604515666 is a wasteful number, since it uses less digits than its factorization.

1680604515666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93366917545 (or 93366917542 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 1680604515666 in words is "one trillion, six hundred eighty billion, six hundred four million, five hundred fifteen thousand, six hundred sixty-six".