161138187184998 has 16 divisors (see below), whose sum is σ = 323080056106416. Its totient is φ = 53578782105600.

The previous prime is 161138187184981. The next prime is 161138187185009. The reversal of 161138187184998 is 899481781831161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33486736411 + ... + 33486741222.

It is an arithmetic number, because the mean of its divisors is an integer number (20192503506651).

Almost surely, 2^{161138187184998} is an apocalyptic number.

161138187184998 is an abundant number, since it is smaller than the sum of its proper divisors (161941868921418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161138187184998 is a wasteful number, since it uses less digits than its factorization.

161138187184998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66973478039.

The product of its digits is 167215104, while the sum is 75.

The spelling of 161138187184998 in words is "one hundred sixty-one trillion, one hundred thirty-eight billion, one hundred eighty-seven million, one hundred eighty-four thousand, nine hundred ninety-eight".