665260220 has 24 divisors (see below), whose sum is σ = 1397541600. Its totient is φ = 266009792.

The previous prime is 665260207. The next prime is 665260229. The reversal of 665260220 is 22062566.

665260220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665260229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90026 + ... + 97134.

It is an arithmetic number, because the mean of its divisors is an integer number (58230900).

Almost surely, 2^665260220 is an apocalyptic number.

It is an amenable number.

665260220 is an abundant number, since it is smaller than the sum of its proper divisors (732281380).

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

665260220 is a wasteful number, since it uses less digits than its factorization.

665260220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11797 (or 11795 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 665260220 is about 25792.6388723605. The cubic root of 665260220 is about 872.9657100572.

The spelling of 665260220 in words is "six hundred sixty-five million, two hundred sixty thousand, two hundred twenty".