665176648 has 16 divisors (see below), whose sum is σ = 1256311980. Its totient is φ = 330160128.

The previous prime is 665176637. The next prime is 665176649. The reversal of 665176648 is 846671566.

It can be written as a sum of positive squares in 2 ways, for example, as 664711524 + 465124 = 25782^2 + 682^2 .

It is not an unprimeable number, because it can be changed into a prime (665176649) 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, 302361 + ... + 304552.

Almost surely, 2^665176648 is an apocalyptic number.

It is an amenable number.

665176648 is a deficient number, since it is larger than the sum of its proper divisors (591135332).

665176648 is a wasteful number, since it uses less digits than its factorization.

665176648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607056 (or 607052 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The square root of 665176648 is about 25791.0187468429. The cubic root of 665176648 is about 872.9291536626.

The spelling of 665176648 in words is "six hundred sixty-five million, one hundred seventy-six thousand, six hundred forty-eight".