665393888 has 36 divisors (see below), whose sum is σ = 1319591952. Its totient is φ = 330272640.

The previous prime is 665393881. The next prime is 665393909. The reversal of 665393888 is 888393566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665393881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2402006 + ... + 2402282.

It is an arithmetic number, because the mean of its divisors is an integer number (36655332).

Almost surely, 2^665393888 is an apocalyptic number.

It is an amenable number.

665393888 is a deficient number, since it is larger than the sum of its proper divisors (654198064).

665393888 is an equidigital number, since it uses as much as digits as its factorization.

665393888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 550 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 56.

The square root of 665393888 is about 25795.2299466394. The cubic root of 665393888 is about 873.0241732784.

The spelling of 665393888 in words is "six hundred sixty-five million, three hundred ninety-three thousand, eight hundred eighty-eight".