165342243561 has 16 divisors (see below), whose sum is σ = 242333676288. Its totient is φ = 99442475600.

The previous prime is 165342243557. The next prime is 165342243587.

165342243561 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 165342243561 - 2² = 165342243557 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (165342243551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19119231 + ... + 19127876.

It is an arithmetic number, because the mean of its divisors is an integer number (15145854768).

Almost surely, 2^165342243561 is an apocalyptic number.

165342243561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165342243561 is a deficient number, since it is larger than the sum of its proper divisors (76991432727).

165342243561 is a wasteful number, since it uses less digits than its factorization.

165342243561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38247252.

The product of its digits is 518400, while the sum is 42.

The spelling of 165342243561 in words is "one hundred sixty-five billion, three hundred forty-two million, two hundred forty-three thousand, five hundred sixty-one".