660126640 has 20 divisors (see below), whose sum is σ = 1534794624. Its totient is φ = 264050624.

The previous prime is 660126631. The next prime is 660126667. The reversal of 660126640 is 46621066.

It is a tau number, because it is divible by the number of its divisors (20).

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, 4125712 + ... + 4125871.

Almost surely, 2^660126640 is an apocalyptic number.

It is an amenable number.

660126640 is an abundant number, since it is smaller than the sum of its proper divisors (874667984).

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

660126640 is a wasteful number, since it uses less digits than its factorization.

660126640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8251596 (or 8251590 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 660126640 is about 25692.9297667666. The cubic root of 660126640 is about 870.7144525391.

The spelling of 660126640 in words is "six hundred sixty million, one hundred twenty-six thousand, six hundred forty".