2117856881736 has 160 divisors (see below), whose sum is σ = 6080728056480. Its totient is φ = 688270867200.

The previous prime is 2117856881719. The next prime is 2117856881743. The reversal of 2117856881736 is 6371886587112.

2117856881736 is a `hidden beast` number, since 21 + 1 + 7 + 8 + 568 + 8 + 17 + 36 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 40649575 + ... + 40701641.

It is an arithmetic number, because the mean of its divisors is an integer number (38004550353).

Almost surely, 2^{2117856881736} 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 2117856881736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3040364028240).

2117856881736 is an abundant number, since it is smaller than the sum of its proper divisors (3962871174744).

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

2117856881736 is a wasteful number, since it uses less digits than its factorization.

2117856881736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53657 (or 53644 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The spelling of 2117856881736 in words is "two trillion, one hundred seventeen billion, eight hundred fifty-six million, eight hundred eighty-one thousand, seven hundred thirty-six".