191677891137980 has 96 divisors (see below), whose sum is σ = 459068453726400. Its totient is φ = 66598291722240.

The previous prime is 191677891137977. The next prime is 191677891138049. The reversal of 191677891137980 is 89731198776191.

It is a super-2 number, since 2×191677891137980² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20782871 + ... + 28553169.

It is an arithmetic number, because the mean of its divisors is an integer number (4781963059650).

Almost surely, 2^{191677891137980} is an apocalyptic number.

191677891137980 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 191677891137980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229534226863200).

191677891137980 is an abundant number, since it is smaller than the sum of its proper divisors (267390562588420).

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

191677891137980 is a wasteful number, since it uses less digits than its factorization.

191677891137980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7775919 (or 7775917 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 77.

The spelling of 191677891137980 in words is "one hundred ninety-one trillion, six hundred seventy-seven billion, eight hundred ninety-one million, one hundred thirty-seven thousand, nine hundred eighty".