161235005138 has 32 divisors (see below), whose sum is σ = 266716323840. Its totient is φ = 72807601680.

The previous prime is 161235005137. The next prime is 161235005171. The reversal of 161235005138 is 831500532161.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161235005098 and 161235005107.

It is not an unprimeable number, because it can be changed into a prime (161235005131) 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, 942506 + ... + 1100357.

It is an arithmetic number, because the mean of its divisors is an integer number (8334885120).

Almost surely, 2^161235005138 is an apocalyptic number.

161235005138 is a deficient number, since it is larger than the sum of its proper divisors (105481318702).

161235005138 is a wasteful number, since it uses less digits than its factorization.

161235005138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042982.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 161235005138 its reverse (831500532161), we get a palindrome (992735537299).

The spelling of 161235005138 in words is "one hundred sixty-one billion, two hundred thirty-five million, five thousand, one hundred thirty-eight".