165586915873 has 4 divisors (see below), whose sum is σ = 166061377300. Its totient is φ = 165112454448.

The previous prime is 165586915849. The next prime is 165586915909. The reversal of 165586915873 is 378519685561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378519685561 = 181 ⋅2091268981.

It can be written as a sum of positive squares in 2 ways, for example, as 125211237904 + 40375677969 = 353852^2 + 200937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165586915873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165586910873) 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, 237230190 + ... + 237230887.

It is an arithmetic number, because the mean of its divisors is an integer number (41515344325).

Almost surely, 2^165586915873 is an apocalyptic number.

It is an amenable number.

165586915873 is a deficient number, since it is larger than the sum of its proper divisors (474461427).

165586915873 is an equidigital number, since it uses as much as digits as its factorization.

165586915873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474461426.

The product of its digits is 54432000, while the sum is 64.

The spelling of 165586915873 in words is "one hundred sixty-five billion, five hundred eighty-six million, nine hundred fifteen thousand, eight hundred seventy-three".