660533665020 has 48 divisors (see below), whose sum is σ = 1884390389280. Its totient is φ = 172818870016.

The previous prime is 660533664971. The next prime is 660533665027. The reversal of 660533665020 is 20566335066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660533665027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103854315 + ... + 103860674.

It is an arithmetic number, because the mean of its divisors is an integer number (39258133110).

Almost surely, 2^660533665020 is an apocalyptic number.

660533665020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660533665020 is an abundant number, since it is smaller than the sum of its proper divisors (1223856724260).

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

660533665020 is a wasteful number, since it uses less digits than its factorization.

660533665020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207715054 (or 207715052 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 42.

The spelling of 660533665020 in words is "six hundred sixty billion, five hundred thirty-three million, six hundred sixty-five thousand, twenty".