161897792424 has 16 divisors (see below), whose sum is σ = 404744481120. Its totient is φ = 53965930800.

The previous prime is 161897792383. The next prime is 161897792429. The reversal of 161897792424 is 424297798161.

It is not an unprimeable number, because it can be changed into a prime (161897792429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3372870652 + ... + 3372870699.

It is an arithmetic number, because the mean of its divisors is an integer number (25296530070).

Almost surely, 2^161897792424 is an apocalyptic number.

It is an amenable number.

161897792424 is an abundant number, since it is smaller than the sum of its proper divisors (242846688696).

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

161897792424 is a wasteful number, since it uses less digits than its factorization.

161897792424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6745741360 (or 6745741356 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 60.

The spelling of 161897792424 in words is "one hundred sixty-one billion, eight hundred ninety-seven million, seven hundred ninety-two thousand, four hundred twenty-four".