165713647513 has 4 divisors (see below), whose sum is σ = 165715992100. Its totient is φ = 165711302928.

The previous prime is 165713647511. The next prime is 165713647549. The reversal of 165713647513 is 315746317561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 161593548169 + 4120099344 = 401987^2 + 64188^2 .

It is a cyclic number.

It is not a de Polignac number, because 165713647513 - 2¹ = 165713647511 is a prime.

It is a super-2 number, since 2×165713647513² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165713647511) 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, 1062870 + ... + 1208767.

It is an arithmetic number, because the mean of its divisors is an integer number (41428998025).

Almost surely, 2^165713647513 is an apocalyptic number.

It is an amenable number.

165713647513 is a deficient number, since it is larger than the sum of its proper divisors (2344587).

165713647513 is an equidigital number, since it uses as much as digits as its factorization.

165713647513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344586.

The product of its digits is 1587600, while the sum is 49.

The spelling of 165713647513 in words is "one hundred sixty-five billion, seven hundred thirteen million, six hundred forty-seven thousand, five hundred thirteen".