2191085455636 has 192 divisors, whose sum is σ = 5174928622080. Its totient is φ = 786818672640.

The previous prime is 2191085455633. The next prime is 2191085455651. The reversal of 2191085455636 is 6365545801912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191085455633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17453106 + ... + 17578198.

It is an arithmetic number, because the mean of its divisors is an integer number (26952753240).

Almost surely, 2^{2191085455636} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191085455636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2587464311040).

2191085455636 is an abundant number, since it is smaller than the sum of its proper divisors (2983843166444).

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

2191085455636 is a wasteful number, since it uses less digits than its factorization.

2191085455636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125234 (or 125232 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 55.

The spelling of 2191085455636 in words is "two trillion, one hundred ninety-one billion, eighty-five million, four hundred fifty-five thousand, six hundred thirty-six".