665274920 has 16 divisors (see below), whose sum is σ = 1496868660. Its totient is φ = 266109952.

The previous prime is 665274917. The next prime is 665274941. The reversal of 665274920 is 29472566.

It can be written as a sum of positive squares in 2 ways, for example, as 629106724 + 36168196 = 25082^2 + 6014^2 .

It is a super-3 number, since 3×665274920³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8315897 + ... + 8315976.

Almost surely, 2^665274920 is an apocalyptic number.

It is an amenable number.

665274920 is an abundant number, since it is smaller than the sum of its proper divisors (831593740).

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

665274920 is a wasteful number, since it uses less digits than its factorization.

665274920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16631884 (or 16631880 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 665274920 is about 25792.9238358120. The cubic root of 665274920 is about 872.9721398727.

The spelling of 665274920 in words is "six hundred sixty-five million, two hundred seventy-four thousand, nine hundred twenty".