161899119744 has 256 divisors, whose sum is σ = 467167409280. Its totient is φ = 49479155712.

The previous prime is 161899119721. The next prime is 161899119817. The reversal of 161899119744 is 447911998161.

It is a super-2 number, since 2×161899119744² (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 31 ways as a sum of consecutive naturals, for example, 188913364 + ... + 188914220.

Almost surely, 2^161899119744 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 161899119744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233583704640).

161899119744 is an abundant number, since it is smaller than the sum of its proper divisors (305268289536).

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

161899119744 is a wasteful number, since it uses less digits than its factorization.

161899119744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1595 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 60.

The spelling of 161899119744 in words is "one hundred sixty-one billion, eight hundred ninety-nine million, one hundred nineteen thousand, seven hundred forty-four".