161321123162 has 4 divisors (see below), whose sum is σ = 241981684746. Its totient is φ = 80660561580.

The previous prime is 161321123153. The next prime is 161321123203. The reversal of 161321123162 is 261321123161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 83920875481 + 77400247681 = 289691^2 + 278209^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40330280789 + ... + 40330280792.

Almost surely, 2^161321123162 is an apocalyptic number.

161321123162 is a deficient number, since it is larger than the sum of its proper divisors (80660561584).

161321123162 is an equidigital number, since it uses as much as digits as its factorization.

161321123162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80660561583.

The product of its digits is 2592, while the sum is 29.

Subtracting 161321123162 from its reverse (261321123161), we obtain a palindrome (99999999999).

The spelling of 161321123162 in words is "one hundred sixty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred sixty-two".