161173791900 has 360 divisors, whose sum is σ = 571567417344. Its totient is φ = 38962166400.

The previous prime is 161173791803. The next prime is 161173791901. The reversal of 161173791900 is 9197371161.

It is a super-2 number, since 2×161173791900² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161173791901) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 34122939 + ... + 34127661.

Almost surely, 2^161173791900 is an apocalyptic number.

161173791900 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 161173791900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285783708672).

161173791900 is an abundant number, since it is smaller than the sum of its proper divisors (410393625444).

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

161173791900 is a wasteful number, since it uses less digits than its factorization.

161173791900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143 (or 5127 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 45.

The spelling of 161173791900 in words is "one hundred sixty-one billion, one hundred seventy-three million, seven hundred ninety-one thousand, nine hundred".