660693530520 has 128 divisors (see below), whose sum is σ = 2249169638400. Its totient is φ = 172436312448.

The previous prime is 660693530503. The next prime is 660693530587. The reversal of 660693530520 is 25035396066.

660693530520 is a `hidden beast` number, since 6 + 6 + 0 + 6 + 93 + 5 + 30 + 520 = 666.

660693530520 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6457254 + ... + 6558773.

It is an arithmetic number, because the mean of its divisors is an integer number (17571637800).

Almost surely, 2^660693530520 is an apocalyptic number.

660693530520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660693530520 is an abundant number, since it is smaller than the sum of its proper divisors (1588476107880).

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

660693530520 is a wasteful number, since it uses less digits than its factorization.

660693530520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016094 (or 13016084 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 45.

The spelling of 660693530520 in words is "six hundred sixty billion, six hundred ninety-three million, five hundred thirty thousand, five hundred twenty".