2181959316702 has 160 divisors (see below), whose sum is σ = 5595320332800. Its totient is φ = 629407195200.

The previous prime is 2181959316653. The next prime is 2181959316743. The reversal of 2181959316702 is 2076139591812.

It is a happy number.

2181959316702 is a `hidden beast` number, since 21 + 8 + 19 + 593 + 16 + 7 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3371799 + ... + 3966477.

It is an arithmetic number, because the mean of its divisors is an integer number (34970752080).

Almost surely, 2^{2181959316702} is an apocalyptic number.

2181959316702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181959316702, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2797660166400).

2181959316702 is an abundant number, since it is smaller than the sum of its proper divisors (3413361016098).

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

2181959316702 is a wasteful number, since it uses less digits than its factorization.

2181959316702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594804 (or 594795 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 2181959316702 in words is "two trillion, one hundred eighty-one billion, nine hundred fifty-nine million, three hundred sixteen thousand, seven hundred two".