665272660 has 48 divisors (see below), whose sum is σ = 1506604176. Its totient is φ = 245302272.

The previous prime is 665272603. The next prime is 665272687. The reversal of 665272660 is 66272566.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 767376 + 664505284 = 876^2 + 25778^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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, 267342 + ... + 269818.

It is an arithmetic number, because the mean of its divisors is an integer number (31387587).

Almost surely, 2^665272660 is an apocalyptic number.

It is an amenable number.

665272660 is an abundant number, since it is smaller than the sum of its proper divisors (841331516).

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

665272660 is a wasteful number, since it uses less digits than its factorization.

665272660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532 (or 3530 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 665272660 is about 25792.8800253093. The cubic root of 665272660 is about 872.9711513494.

The spelling of 665272660 in words is "six hundred sixty-five million, two hundred seventy-two thousand, six hundred sixty".