660211560 has 128 divisors (see below), whose sum is σ = 2228169600. Its totient is φ = 176033088.

The previous prime is 660211537. The next prime is 660211571. The reversal of 660211560 is 65112066.

It is a happy number.

660211560 is a `hidden beast` number, since 6 + 602 + 1 + 1 + 56 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 83707 + ... + 91253.

It is an arithmetic number, because the mean of its divisors is an integer number (17407575).

Almost surely, 2^660211560 is an apocalyptic number.

660211560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660211560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114084800).

660211560 is an abundant number, since it is smaller than the sum of its proper divisors (1567958040).

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

660211560 is an equidigital number, since it uses as much as digits as its factorization.

660211560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7579 (or 7557 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 660211560 is about 25694.5823083389. The cubic root of 660211560 is about 870.7517877495.

The spelling of 660211560 in words is "six hundred sixty million, two hundred eleven thousand, five hundred sixty".