660740856 has 16 divisors (see below), whose sum is σ = 1651852200. Its totient is φ = 220246944.

The previous prime is 660740833. The next prime is 660740863. The reversal of 660740856 is 658047066.

It is a happy number.

660740856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×660740856² = 873156957575225472, which contains 22 as substring.

It is a congruent number.

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, 13765411 + ... + 13765458.

Almost surely, 2^660740856 is an apocalyptic number.

It is an amenable number.

660740856 is an abundant number, since it is smaller than the sum of its proper divisors (991111344).

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

660740856 is a wasteful number, since it uses less digits than its factorization.

660740856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27530878 (or 27530874 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 660740856 is about 25704.8800036102. The cubic root of 660740856 is about 870.9844214263.

The spelling of 660740856 in words is "six hundred sixty million, seven hundred forty thousand, eight hundred fifty-six".