195899189922 has 18 divisors (see below), whose sum is σ = 424452313467. Its totient is φ = 65299104036.

The previous prime is 195899189887. The next prime is 195899189929. The reversal of 195899189922 is 229981998591.

195899189922 is a `hidden beast` number, since 1 + 9 + 589 + 9 + 18 + 9 + 9 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 97949594961 + 97949594961 = 312969^2 + 312969^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=312969.

It is a super-2 number, since 2×195899189922² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (195899189929) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1825653 + ... + 1929975.

Almost surely, 2^195899189922 is an apocalyptic number.

195899189922 is an abundant number, since it is smaller than the sum of its proper divisors (228553123545).

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

195899189922 is an frugal number, since it uses more digits than its factorization.

195899189922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208654 (or 104328 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 72.

Multiplying 195899189922 by its sum of digits (72), we get a square (14104741674384 = 3755628²).

The spelling of 195899189922 in words is "one hundred ninety-five billion, eight hundred ninety-nine million, one hundred eighty-nine thousand, nine hundred twenty-two".