665369972 has 12 divisors (see below), whose sum is σ = 1164632196. Its totient is φ = 332617920.

The previous prime is 665369959. The next prime is 665369989. The reversal of 665369972 is 279963566.

It can be written as a sum of positive squares in 2 ways, for example, as 359329936 + 306040036 = 18956^2 + 17494^2 .

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 3 ways as a sum of consecutive naturals, for example, 10472 + ... + 37952.

It is an arithmetic number, because the mean of its divisors is an integer number (97052683).

Almost surely, 2^665369972 is an apocalyptic number.

It is an amenable number.

665369972 is a deficient number, since it is larger than the sum of its proper divisors (499262224).

665369972 is a wasteful number, since it uses less digits than its factorization.

665369972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33538 (or 33536 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 53.

The square root of 665369972 is about 25794.7663683934. The cubic root of 665369972 is about 873.0137135609.

The spelling of 665369972 in words is "six hundred sixty-five million, three hundred sixty-nine thousand, nine hundred seventy-two".