165648615617 has 8 divisors (see below), whose sum is σ = 170112006792. Its totient is φ = 161205376000.

The previous prime is 165648615611. The next prime is 165648615673. The reversal of 165648615617 is 716516846561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50032295041 + 115616320576 = 223679^2 + 340024^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165648615617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165648615611) 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, 5021228 + ... + 5054109.

It is an arithmetic number, because the mean of its divisors is an integer number (21264000849).

Almost surely, 2^165648615617 is an apocalyptic number.

It is an amenable number.

165648615617 is a deficient number, since it is larger than the sum of its proper divisors (4463391175).

165648615617 is a wasteful number, since it uses less digits than its factorization.

165648615617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10075779.

The product of its digits is 7257600, while the sum is 56.

The spelling of 165648615617 in words is "one hundred sixty-five billion, six hundred forty-eight million, six hundred fifteen thousand, six hundred seventeen".