680321661516 has 36 divisors (see below), whose sum is σ = 1965373689552. Its totient is φ = 194377617504.

The previous prime is 680321661511. The next prime is 680321661529. The reversal of 680321661516 is 615166123086.

680321661516 is a `hidden beast` number, since 6 + 8 + 0 + 3 + 2 + 16 + 615 + 16 = 666.

680321661516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (680321661511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1349844315 + ... + 1349844818.

Almost surely, 2^680321661516 is an apocalyptic number.

It is an amenable number.

680321661516 is an abundant number, since it is smaller than the sum of its proper divisors (1285052028036).

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

680321661516 is a wasteful number, since it uses less digits than its factorization.

680321661516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699689150 (or 2699689145 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 680321661516 in words is "six hundred eighty billion, three hundred twenty-one million, six hundred sixty-one thousand, five hundred sixteen".