2156668180992 has 640 divisors, whose sum is σ = 7476496473600. Its totient is φ = 607643762688.

The previous prime is 2156668180883. The next prime is 2156668181039. The reversal of 2156668180992 is 2990818666512.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113029309 + ... + 113048387.

It is an arithmetic number, because the mean of its divisors is an integer number (11682025740).

Almost surely, 2^{2156668180992} 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 2156668180992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3738248236800).

2156668180992 is an abundant number, since it is smaller than the sum of its proper divisors (5319828292608).

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

2156668180992 is a wasteful number, since it uses less digits than its factorization.

2156668180992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19173 (or 19151 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 2156668180992 in words is "two trillion, one hundred fifty-six billion, six hundred sixty-eight million, one hundred eighty thousand, nine hundred ninety-two".