665313717648 has 40 divisors (see below), whose sum is σ = 1793454372288. Its totient is φ = 212129011072.

The previous prime is 665313717643. The next prime is 665313717737. The reversal of 665313717648 is 846717313566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665313717641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301318515 + ... + 301320722.

Almost surely, 2^665313717648 is an apocalyptic number.

It is an amenable number.

665313717648 is an abundant number, since it is smaller than the sum of its proper divisors (1128140654640).

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

665313717648 is a wasteful number, since it uses less digits than its factorization.

665313717648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602639271 (or 602639265 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 57.

The spelling of 665313717648 in words is "six hundred sixty-five billion, three hundred thirteen million, seven hundred seventeen thousand, six hundred forty-eight".