660664600 has 96 divisors (see below), whose sum is σ = 1600477920. Its totient is φ = 253393920.

The previous prime is 660664579. The next prime is 660664619. The reversal of 660664600 is 6466066.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 539589 + ... + 540811.

It is an arithmetic number, because the mean of its divisors is an integer number (16671645).

Almost surely, 2^660664600 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660664600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800238960).

660664600 is an abundant number, since it is smaller than the sum of its proper divisors (939813320).

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

660664600 is a wasteful number, since it uses less digits than its factorization.

660664600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 1340 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 660664600 is about 25703.3966626981. The cubic root of 660664600 is about 870.9509134114.

The spelling of 660664600 in words is "six hundred sixty million, six hundred sixty-four thousand, six hundred".