161365558983 has 16 divisors (see below), whose sum is σ = 226876051200. Its totient is φ = 101735956800.

The previous prime is 161365558961. The next prime is 161365558997. The reversal of 161365558983 is 389855563161.

It is a happy number.

It is not a de Polignac number, because 161365558983 - 2¹⁰ = 161365557959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161365558183) 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, 2455243 + ... + 2520108.

It is an arithmetic number, because the mean of its divisors is an integer number (14179753200).

Almost surely, 2^161365558983 is an apocalyptic number.

161365558983 is a deficient number, since it is larger than the sum of its proper divisors (65510492217).

161365558983 is a wasteful number, since it uses less digits than its factorization.

161365558983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975942.

The product of its digits is 23328000, while the sum is 60.

The spelling of 161365558983 in words is "one hundred sixty-one billion, three hundred sixty-five million, five hundred fifty-eight thousand, nine hundred eighty-three".