165115115665513 has 4 divisors (see below), whose sum is σ = 177816278409028. Its totient is φ = 152413952922000.

The previous prime is 165115115665447. The next prime is 165115115665519. The reversal of 165115115665513 is 315566511511561.

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 55519070036544 + 109596045628969 = 7451112^2 + 10468813^2 .

It is a cyclic number.

It is not a de Polignac number, because 165115115665513 - 2²⁹ = 165114578794601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165115115665519) 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, 6350581371738 + ... + 6350581371763.

It is an arithmetic number, because the mean of its divisors is an integer number (44454069602257).

Almost surely, 2^{165115115665513} is an apocalyptic number.

165115115665513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165115115665513 is a deficient number, since it is larger than the sum of its proper divisors (12701162743515).

165115115665513 is a wasteful number, since it uses less digits than its factorization.

165115115665513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12701162743514.

The product of its digits is 2025000, while the sum is 52.

The spelling of 165115115665513 in words is "one hundred sixty-five trillion, one hundred fifteen billion, one hundred fifteen million, six hundred sixty-five thousand, five hundred thirteen".