165115106561 has 8 divisors (see below), whose sum is σ = 170784466944. Its totient is φ = 159523944480.

The previous prime is 165115106483. The next prime is 165115106567. The reversal of 165115106561 is 165601511561.

It is a happy number.

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

It is not a de Polignac number, because 165115106561 - 2³⁴ = 147935237377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165115106567) 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, 19545281 + ... + 19553726.

It is an arithmetic number, because the mean of its divisors is an integer number (21348058368).

Almost surely, 2^165115106561 is an apocalyptic number.

It is an amenable number.

165115106561 is a deficient number, since it is larger than the sum of its proper divisors (5669360383).

165115106561 is a wasteful number, since it uses less digits than its factorization.

165115106561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39099151.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 165115106561 in words is "one hundred sixty-five billion, one hundred fifteen million, one hundred six thousand, five hundred sixty-one".