161139840000 has 880 divisors, whose sum is σ = 580138796160. Its totient is φ = 39649280000.

The previous prime is 161139839999. The next prime is 161139840049. The reversal of 161139840000 is 48931161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1810559956 + ... + 1810560044.

It is an arithmetic number, because the mean of its divisors is an integer number (659248632).

Almost surely, 2^161139840000 is an apocalyptic number.

161139840000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161139840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290069398080).

161139840000 is an abundant number, since it is smaller than the sum of its proper divisors (418998956160).

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

161139840000 is an equidigital number, since it uses as much as digits as its factorization.

161139840000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The spelling of 161139840000 in words is "one hundred sixty-one billion, one hundred thirty-nine million, eight hundred forty thousand".