161011556200 has 96 divisors (see below), whose sum is σ = 408627372960. Its totient is φ = 58514745600.

The previous prime is 161011556191. The next prime is 161011556213. The reversal of 161011556200 is 2655110161.

It is a happy number.

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, 3822454 + ... + 3864346.

It is an arithmetic number, because the mean of its divisors is an integer number (4256535135).

Almost surely, 2^161011556200 is an apocalyptic number.

161011556200 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 161011556200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204313686480).

161011556200 is an abundant number, since it is smaller than the sum of its proper divisors (247615816760).

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

161011556200 is a wasteful number, since it uses less digits than its factorization.

161011556200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43667 (or 43658 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 161011556200 its reverse (2655110161), we get a palindrome (163666666361).

The spelling of 161011556200 in words is "one hundred sixty-one billion, eleven million, five hundred fifty-six thousand, two hundred".