165531844138 has 8 divisors (see below), whose sum is σ = 248567951520. Its totient is φ = 82675860300.

The previous prime is 165531844111. The next prime is 165531844139. The reversal of 165531844138 is 831448135561.

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

It is a junction number, because it is equal to n+sod(n) for n = 165531844091 and 165531844100.

It is not an unprimeable number, because it can be changed into a prime (165531844139) 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, 45028588 + ... + 45032263.

It is an arithmetic number, because the mean of its divisors is an integer number (31070993940).

Almost surely, 2^165531844138 is an apocalyptic number.

165531844138 is a deficient number, since it is larger than the sum of its proper divisors (83036107382).

165531844138 is an equidigital number, since it uses as much as digits as its factorization.

165531844138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90061772.

The product of its digits is 1382400, while the sum is 49.

Adding to 165531844138 its reverse (831448135561), we get a palindrome (996979979699).

The spelling of 165531844138 in words is "one hundred sixty-five billion, five hundred thirty-one million, eight hundred forty-four thousand, one hundred thirty-eight".