191011982980 has 72 divisors (see below), whose sum is σ = 496405167552. Its totient is φ = 60452136576.

The previous prime is 191011982971. The next prime is 191011982981. The reversal of 191011982980 is 89289110191.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (191011982981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4012942 + ... + 4060261.

It is an arithmetic number, because the mean of its divisors is an integer number (6894516216).

Almost surely, 2^191011982980 is an apocalyptic number.

191011982980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191011982980 is an abundant number, since it is smaller than the sum of its proper divisors (305393184572).

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

191011982980 is a wasteful number, since it uses less digits than its factorization.

191011982980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073245 (or 8073230 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 49.

The spelling of 191011982980 in words is "one hundred ninety-one billion, eleven million, nine hundred eighty-two thousand, nine hundred eighty".