665885018 has 16 divisors (see below), whose sum is σ = 1033749864. Its totient is φ = 321469440.

The previous prime is 665884997. The next prime is 665885027. The reversal of 665885018 is 810588566.

665885018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 585010969 + 80874049 = 24187^2 + 8993^2 .

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, 33905 + ... + 49812.

Almost surely, 2^665885018 is an apocalyptic number.

665885018 is a deficient number, since it is larger than the sum of its proper divisors (367864846).

665885018 is a wasteful number, since it uses less digits than its factorization.

665885018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83857.

The product of its (nonzero) digits is 460800, while the sum is 47.

The square root of 665885018 is about 25804.7479739679. The cubic root of 665885018 is about 873.2389147127.

The spelling of 665885018 in words is "six hundred sixty-five million, eight hundred eighty-five thousand, eighteen".