2291591844864 has 880 divisors, whose sum is σ = 8049312311040. Its totient is φ = 635895152640.

The previous prime is 2291591844833. The next prime is 2291591844911. The reversal of 2291591844864 is 4684481951922.

It is a happy number.

2291591844864 is a `hidden beast` number, since 2 + 2 + 91 + 59 + 18 + 4 + 486 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3152120469 + ... + 3152121195.

It is an arithmetic number, because the mean of its divisors is an integer number (9146945808).

Almost surely, 2^{2291591844864} is an apocalyptic number.

2291591844864 is a gapful number since it is divisible by the number (24) 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 2291591844864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4024656155520).

2291591844864 is an abundant number, since it is smaller than the sum of its proper divisors (5757720466176).

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

2291591844864 is an equidigital number, since it uses as much as digits as its factorization.

2291591844864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 889 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 63.

The spelling of 2291591844864 in words is "two trillion, two hundred ninety-one billion, five hundred ninety-one million, eight hundred forty-four thousand, eight hundred sixty-four".