665927972 has 48 divisors (see below), whose sum is σ = 1212422400. Its totient is φ = 319887360.

The previous prime is 665927963. The next prime is 665928041. The reversal of 665927972 is 279729566.

It is a happy 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, 3450308 + ... + 3450500.

It is an arithmetic number, because the mean of its divisors is an integer number (25258800).

Almost surely, 2^665927972 is an apocalyptic number.

It is an amenable number.

665927972 is a deficient number, since it is larger than the sum of its proper divisors (546494428).

665927972 is a wasteful number, since it uses less digits than its factorization.

665927972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 514 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 53.

The square root of 665927972 is about 25805.5802492407. The cubic root of 665927972 is about 873.2576908762.

The spelling of 665927972 in words is "six hundred sixty-five million, nine hundred twenty-seven thousand, nine hundred seventy-two".