665591488 has 28 divisors (see below), whose sum is σ = 1339394832. Its totient is φ = 328106240.

The previous prime is 665591473. The next prime is 665591551. The reversal of 665591488 is 884195566.

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, 68695 + ... + 77782.

Almost surely, 2^665591488 is an apocalyptic number.

It is an amenable number.

665591488 is an abundant number, since it is smaller than the sum of its proper divisors (673803344).

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

665591488 is a wasteful number, since it uses less digits than its factorization.

665591488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146560 (or 146550 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 52.

The square root of 665591488 is about 25799.0598278309. The cubic root of 665591488 is about 873.1105845034.

The spelling of 665591488 in words is "six hundred sixty-five million, five hundred ninety-one thousand, four hundred eighty-eight".