2191976459712 has 168 divisors, whose sum is σ = 6777514816800. Its totient is φ = 673326950400.

The previous prime is 2191976459707. The next prime is 2191976459723. The reversal of 2191976459712 is 2179546791912.

2191976459712 is a `hidden beast` number, since 2 + 1 + 91 + 97 + 6 + 459 + 7 + 1 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2191976459712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4240962 + ... + 4729662.

It is an arithmetic number, because the mean of its divisors is an integer number (40342350100).

Almost surely, 2^{2191976459712} 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 2191976459712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3388757408400).

2191976459712 is an abundant number, since it is smaller than the sum of its proper divisors (4585538357088).

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

2191976459712 is a wasteful number, since it uses less digits than its factorization.

2191976459712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489331 (or 489318 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 63.

The spelling of 2191976459712 in words is "two trillion, one hundred ninety-one billion, nine hundred seventy-six million, four hundred fifty-nine thousand, seven hundred twelve".