161220199344 has 160 divisors (see below), whose sum is σ = 433803734784. Its totient is φ = 51552399360.

The previous prime is 161220199249. The next prime is 161220199381. The reversal of 161220199344 is 443991022161.

It is a junction number, because it is equal to n+sod(n) for n = 161220199296 and 161220199305.

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, 125658127 + ... + 125659409.

Almost surely, 2^161220199344 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 161220199344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216901867392).

161220199344 is an abundant number, since it is smaller than the sum of its proper divisors (272583535440).

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

161220199344 is a wasteful number, since it uses less digits than its factorization.

161220199344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 161220199344 in words is "one hundred sixty-one billion, two hundred twenty million, one hundred ninety-nine thousand, three hundred forty-four".