660508988 has 12 divisors (see below), whose sum is σ = 1195749240. Its totient is φ = 318866352.

The previous prime is 660508969. The next prime is 660508999. The reversal of 660508988 is 889805066.

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, 2846906 + ... + 2847137.

It is an arithmetic number, because the mean of its divisors is an integer number (99645770).

Almost surely, 2^660508988 is an apocalyptic number.

It is an amenable number.

660508988 is a deficient number, since it is larger than the sum of its proper divisors (535240252).

660508988 is a wasteful number, since it uses less digits than its factorization.

660508988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5694076 (or 5694074 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 660508988 is about 25700.3694136874. The cubic root of 660508988 is about 870.8825271956.

The spelling of 660508988 in words is "six hundred sixty million, five hundred eight thousand, nine hundred eighty-eight".