665135404 has 24 divisors (see below), whose sum is σ = 1240747200. Its totient is φ = 310899456.

The previous prime is 665135377. The next prime is 665135417. The reversal of 665135404 is 404531566.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 665135404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22692 + ... + 42955.

It is an arithmetic number, because the mean of its divisors is an integer number (51697800).

Almost surely, 2^665135404 is an apocalyptic number.

It is an amenable number.

665135404 is a deficient number, since it is larger than the sum of its proper divisors (575611796).

665135404 is a wasteful number, since it uses less digits than its factorization.

665135404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65817 (or 65815 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 665135404 is about 25790.2191537800. The cubic root of 665135404 is about 872.9111114206.

It can be divided in two parts, 66513 and 5404, that added together give a palindrome (71917).

The spelling of 665135404 in words is "six hundred sixty-five million, one hundred thirty-five thousand, four hundred four".