161898947244 has 72 divisors (see below), whose sum is σ = 418095437760. Its totient is φ = 52799956992.

The previous prime is 161898947239. The next prime is 161898947261. The reversal of 161898947244 is 442749898161.

161898947244 is a `hidden beast` number, since 1 + 6 + 1 + 89 + 89 + 472 + 4 + 4 = 666.

It is a super-2 number, since 2×161898947244² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5448652 + ... + 5478284.

It is an arithmetic number, because the mean of its divisors is an integer number (5806881080).

Almost surely, 2^161898947244 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 161898947244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209047718880).

161898947244 is an abundant number, since it is smaller than the sum of its proper divisors (256196490516).

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

161898947244 is a wasteful number, since it uses less digits than its factorization.

161898947244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32919 (or 32914 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 161898947244 in words is "one hundred sixty-one billion, eight hundred ninety-eight million, nine hundred forty-seven thousand, two hundred forty-four".