191996338880 has 112 divisors (see below), whose sum is σ = 469841677536. Its totient is φ = 74676142080.

The previous prime is 191996338823. The next prime is 191996338909. The reversal of 191996338880 is 88833699191.

191996338880 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23522000 + ... + 23530160.

It is an arithmetic number, because the mean of its divisors is an integer number (4195014978).

Almost surely, 2^191996338880 is an apocalyptic number.

191996338880 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 191996338880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234920838768).

191996338880 is an abundant number, since it is smaller than the sum of its proper divisors (277845338656).

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

191996338880 is a wasteful number, since it uses less digits than its factorization.

191996338880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10202 (or 10192 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 65.

The spelling of 191996338880 in words is "one hundred ninety-one billion, nine hundred ninety-six million, three hundred thirty-eight thousand, eight hundred eighty".