665475894 has 12 divisors (see below), whose sum is σ = 1441864476. Its totient is φ = 221825292.

The previous prime is 665475887. The next prime is 665475917. The reversal of 665475894 is 498574566.

665475894 is a `hidden beast` number, since 6 + 6 + 54 + 7 + 589 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 665475894.

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 5 ways as a sum of consecutive naturals, for example, 18485424 + ... + 18485459.

It is an arithmetic number, because the mean of its divisors is an integer number (120155373).

Almost surely, 2^665475894 is an apocalyptic number.

665475894 is an abundant number, since it is smaller than the sum of its proper divisors (776388582).

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

665475894 is a wasteful number, since it uses less digits than its factorization.

665475894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36970891 (or 36970888 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 665475894 is about 25796.8194551189. The cubic root of 665475894 is about 873.0600368878.

The spelling of 665475894 in words is "six hundred sixty-five million, four hundred seventy-five thousand, eight hundred ninety-four".