2191055086044 has 192 divisors, whose sum is σ = 6409697280000. Its totient is φ = 641245118400.

The previous prime is 2191055086037. The next prime is 2191055086061. The reversal of 2191055086044 is 4406805501912.

2191055086044 is a `hidden beast` number, since 2 + 1 + 9 + 10 + 550 + 86 + 0 + 4 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

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, 18317559 + ... + 18436785.

It is an arithmetic number, because the mean of its divisors is an integer number (33383840000).

Almost surely, 2^{2191055086044} 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 2191055086044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3204848640000).

2191055086044 is an abundant number, since it is smaller than the sum of its proper divisors (4218642193956).

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

2191055086044 is a wasteful number, since it uses less digits than its factorization.

2191055086044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119781 (or 119773 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 2191055086044 in words is "two trillion, one hundred ninety-one billion, fifty-five million, eighty-six thousand, forty-four".