2161846986 has 48 divisors (see below), whose sum is σ = 4708136160. Its totient is φ = 661452480.

The previous prime is 2161846943. The next prime is 2161846993. The reversal of 2161846986 is 6896481612.

It is a Curzon 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, 177645 + ... + 189423.

It is an arithmetic number, because the mean of its divisors is an integer number (98086170).

Almost surely, 2^2161846986 is an apocalyptic number.

2161846986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161846986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2354068080).

2161846986 is an abundant number, since it is smaller than the sum of its proper divisors (2546289174).

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

2161846986 is a wasteful number, since it uses less digits than its factorization.

2161846986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11991 (or 11978 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 2161846986 is about 46495.6663141846. Note that the first 3 decimals coincide. The cubic root of 2161846986 is about 1293.0291544876.

The spelling of 2161846986 in words is "two billion, one hundred sixty-one million, eight hundred forty-six thousand, nine hundred eighty-six".