660068680 has 16 divisors (see below), whose sum is σ = 1485154620. Its totient is φ = 264027456.

The previous prime is 660068677. The next prime is 660068723. The reversal of 660068680 is 86860066.

It can be written as a sum of positive squares in 2 ways, for example, as 623900484 + 36168196 = 24978^2 + 6014^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 16501717 = 660068680 / (6 + 6 + 0 + 0 + 6 + 8 + 6 + 8 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8250819 + ... + 8250898.

Almost surely, 2^660068680 is an apocalyptic number.

It is an amenable number.

660068680 is an abundant number, since it is smaller than the sum of its proper divisors (825085940).

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

660068680 is a wasteful number, since it uses less digits than its factorization.

660068680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16501728 (or 16501724 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 660068680 is about 25691.8018052452. The cubic root of 660068680 is about 870.6889684963.

The spelling of 660068680 in words is "six hundred sixty million, sixty-eight thousand, six hundred eighty".