665269940 has 24 divisors (see below), whose sum is σ = 1457809920. Its totient is φ = 254537888.

The previous prime is 665269907. The next prime is 665269967. The reversal of 665269940 is 49962566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722660 + ... + 723579.

It is an arithmetic number, because the mean of its divisors is an integer number (60742080).

Almost surely, 2^665269940 is an apocalyptic number.

It is an amenable number.

665269940 is an abundant number, since it is smaller than the sum of its proper divisors (792539980).

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

665269940 is a wasteful number, since it uses less digits than its factorization.

665269940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446271 (or 1446269 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 665269940 is about 25792.8272975260. The cubic root of 665269940 is about 872.9699616193.

The spelling of 665269940 in words is "six hundred sixty-five million, two hundred sixty-nine thousand, nine hundred forty".