665825424 has 40 divisors (see below), whose sum is σ = 1876418592. Its totient is φ = 201765120.

The previous prime is 665825387. The next prime is 665825449. The reversal of 665825424 is 424528566.

It is a happy number.

665825424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 629989 + ... + 631044.

Almost surely, 2^665825424 is an apocalyptic number.

It is an amenable number.

665825424 is an abundant number, since it is smaller than the sum of its proper divisors (1210593168).

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

665825424 is a wasteful number, since it uses less digits than its factorization.

665825424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261055 (or 1261049 counting only the distinct ones).

The product of its digits is 460800, while the sum is 42.

The square root of 665825424 is about 25803.5932381519. The cubic root of 665825424 is about 873.2128634921.

The spelling of 665825424 in words is "six hundred sixty-five million, eight hundred twenty-five thousand, four hundred twenty-four".