665336660 has 48 divisors (see below), whose sum is σ = 1412040000. Its totient is φ = 263326464.

The previous prime is 665336629. The next prime is 665336681. The reversal of 665336660 is 66633566.

665336660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665336660² = 885345742279911200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1333091 + ... + 1333589.

It is an arithmetic number, because the mean of its divisors is an integer number (29417500).

Almost surely, 2^665336660 is an apocalyptic number.

It is an amenable number.

665336660 is an abundant number, since it is smaller than the sum of its proper divisors (746703340).

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

665336660 is a wasteful number, since it uses less digits than its factorization.

665336660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 41.

The square root of 665336660 is about 25794.1206479306. The cubic root of 665336660 is about 872.9991440636. Note that the first 3 decimals are identical.

The spelling of 665336660 in words is "six hundred sixty-five million, three hundred thirty-six thousand, six hundred sixty".