161099203536 has 200 divisors, whose sum is σ = 481830893984. Its totient is φ = 51925328640.

The previous prime is 161099203513. The next prime is 161099203549. The reversal of 161099203536 is 635302990161.

161099203536 is a `hidden beast` number, since 1 + 6 + 1 + 0 + 99 + 20 + 3 + 536 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 161099203491 and 161099203500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7805871 + ... + 7826481.

Almost surely, 2^161099203536 is an apocalyptic number.

161099203536 is a gapful number since it is divisible by the number (16) 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 161099203536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240915446992).

161099203536 is an abundant number, since it is smaller than the sum of its proper divisors (320731690448).

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

161099203536 is a wasteful number, since it uses less digits than its factorization.

161099203536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20831 (or 20816 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The spelling of 161099203536 in words is "one hundred sixty-one billion, ninety-nine million, two hundred three thousand, five hundred thirty-six".