665611896 has 32 divisors (see below), whose sum is σ = 1665959040. Its totient is φ = 221613408.

The previous prime is 665611871. The next prime is 665611939. The reversal of 665611896 is 698116566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5655 + ... + 36921.

It is an arithmetic number, because the mean of its divisors is an integer number (52061220).

Almost surely, 2^665611896 is an apocalyptic number.

It is an amenable number.

665611896 is an abundant number, since it is smaller than the sum of its proper divisors (1000347144).

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

665611896 is a wasteful number, since it uses less digits than its factorization.

665611896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32163 (or 32159 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 665611896 is about 25799.4553430882. The cubic root of 665611896 is about 873.1195080244.

The spelling of 665611896 in words is "six hundred sixty-five million, six hundred eleven thousand, eight hundred ninety-six".