161321123160 has 48 divisors (see below), whose sum is σ = 524293651440. Its totient is φ = 43018966080.

The previous prime is 161321123153. The next prime is 161321123203. The reversal of 161321123160 is 61321123161.

It is a happy number.

161321123160 is a `hidden beast` number, since 1 + 61 + 321 + 123 + 160 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224056756 + ... + 224057475.

It is an arithmetic number, because the mean of its divisors is an integer number (10922784405).

Almost surely, 2^161321123160 is an apocalyptic number.

161321123160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161321123160 is an abundant number, since it is smaller than the sum of its proper divisors (362972528280).

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

161321123160 is a wasteful number, since it uses less digits than its factorization.

161321123160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448114248 (or 448114241 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

Subtracting from 161321123160 its reverse (61321123161), we obtain a palindrome (99999999999).

The spelling of 161321123160 in words is "one hundred sixty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred sixty".