665313717649 has 8 divisors (see below), whose sum is σ = 760379175360. Its totient is φ = 570253420176.

The previous prime is 665313717643. The next prime is 665313717737. The reversal of 665313717649 is 946717313566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665313717649 - 2³ = 665313717641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665313717593 and 665313717602.

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, 1009714 + ... + 1533019.

It is an arithmetic number, because the mean of its divisors is an integer number (95047396920).

Almost surely, 2^665313717649 is an apocalyptic number.

It is an amenable number.

665313717649 is a deficient number, since it is larger than the sum of its proper divisors (95065457711).

665313717649 is a wasteful number, since it uses less digits than its factorization.

665313717649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580119.

The product of its digits is 17146080, while the sum is 58.

The spelling of 665313717649 in words is "six hundred sixty-five billion, three hundred thirteen million, seven hundred seventeen thousand, six hundred forty-nine".