660864816 has 60 divisors (see below), whose sum is σ = 1867856640. Its totient is φ = 218102400.

The previous prime is 660864781. The next prime is 660864823. The reversal of 660864816 is 618468066.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8176 + ... + 37263.

It is an arithmetic number, because the mean of its divisors is an integer number (31130944).

Almost surely, 2^660864816 is an apocalyptic number.

It is an amenable number.

660864816 is an abundant number, since it is smaller than the sum of its proper divisors (1206991824).

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

660864816 is a wasteful number, since it uses less digits than its factorization.

660864816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45554 (or 45545 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 660864816 is about 25707.2911058322. The cubic root of 660864816 is about 871.0388857834.

The spelling of 660864816 in words is "six hundred sixty million, eight hundred sixty-four thousand, eight hundred sixteen".