655020660 has 48 divisors (see below), whose sum is σ = 2096067456. Its totient is φ = 149718912.

The previous prime is 655020643. The next prime is 655020671. The reversal of 655020660 is 66020556.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 779367 + ... + 780206.

It is an arithmetic number, because the mean of its divisors is an integer number (43668072).

Almost surely, 2^655020660 is an apocalyptic number.

655020660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655020660 is an abundant number, since it is smaller than the sum of its proper divisors (1441046796).

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

655020660 is a wasteful number, since it uses less digits than its factorization.

655020660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559592 (or 1559590 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 655020660 is about 25593.3714074563. The cubic root of 655020660 is about 868.4636911025.

The spelling of 655020660 in words is "six hundred fifty-five million, twenty thousand, six hundred sixty".