161722598268 has 192 divisors, whose sum is σ = 495272558592. Its totient is φ = 39823365120.

The previous prime is 161722598231. The next prime is 161722598269. The reversal of 161722598268 is 862895227161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161722598269) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2367805 + ... + 2435147.

It is an arithmetic number, because the mean of its divisors is an integer number (2579544576).

Almost surely, 2^161722598268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161722598268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247636279296).

161722598268 is an abundant number, since it is smaller than the sum of its proper divisors (333549960324).

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

161722598268 is a wasteful number, since it uses less digits than its factorization.

161722598268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67504 (or 67502 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 57.

The spelling of 161722598268 in words is "one hundred sixty-one billion, seven hundred twenty-two million, five hundred ninety-eight thousand, two hundred sixty-eight".