665296672 has 24 divisors (see below), whose sum is σ = 1310809500. Its totient is φ = 332392704.

The previous prime is 665296657. The next prime is 665296679. The reversal of 665296672 is 276692566.

It can be written as a sum of positive squares in 2 ways, for example, as 661312656 + 3984016 = 25716^2 + 1996^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (665296679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38454 + ... + 53002.

Almost surely, 2^665296672 is an apocalyptic number.

It is an amenable number.

665296672 is a deficient number, since it is larger than the sum of its proper divisors (645512828).

665296672 is a wasteful number, since it uses less digits than its factorization.

665296672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15988 (or 15980 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 49.

The square root of 665296672 is about 25793.3454984033. The cubic root of 665296672 is about 872.9816540763.

The spelling of 665296672 in words is "six hundred sixty-five million, two hundred ninety-six thousand, six hundred seventy-two".