2161885144 has 16 divisors (see below), whose sum is σ = 4055574600. Its totient is φ = 1080398592.

The previous prime is 2161885093. The next prime is 2161885163. The reversal of 2161885144 is 4415881612.

It is a junction number, because it is equal to n+sod(n) for n = 2161885097 and 2161885106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50854 + ... + 83125.

Almost surely, 2^2161885144 is an apocalyptic number.

It is an amenable number.

2161885144 is a deficient number, since it is larger than the sum of its proper divisors (1893689456).

2161885144 is a wasteful number, since it uses less digits than its factorization.

2161885144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136002 (or 135998 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 2161885144 is about 46496.0766516918. The cubic root of 2161885144 is about 1293.0367620436.

The spelling of 2161885144 in words is "two billion, one hundred sixty-one million, eight hundred eighty-five thousand, one hundred forty-four".