2161846985 has 16 divisors (see below), whose sum is σ = 2624852736. Its totient is φ = 1709167488.

The previous prime is 2161846943. The next prime is 2161846993. The reversal of 2161846985 is 5896481612.

It is a cyclic number.

It is not a de Polignac number, because 2161846985 - 2²² = 2157652681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148544 + ... + 162446.

It is an arithmetic number, because the mean of its divisors is an integer number (164053296).

Almost surely, 2^2161846985 is an apocalyptic number.

It is an amenable number.

2161846985 is a deficient number, since it is larger than the sum of its proper divisors (463005751).

2161846985 is a wasteful number, since it uses less digits than its factorization.

2161846985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14272.

The product of its digits is 829440, while the sum is 50.

The square root of 2161846985 is about 46495.6663034309. Note that the first 3 decimals coincide. The cubic root of 2161846985 is about 1293.0291542882.

The spelling of 2161846985 in words is "two billion, one hundred sixty-one million, eight hundred forty-six thousand, nine hundred eighty-five".