2161673892 has 120 divisors (see below), whose sum is σ = 6479211200. Its totient is φ = 615625920.

The previous prime is 2161673869. The next prime is 2161673893. The reversal of 2161673892 is 2983761612.

2161673892 is a `hidden beast` number, since 21 + 616 + 7 + 3 + 8 + 9 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (2161673893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 790167 + ... + 792897.

Almost surely, 2^2161673892 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 2161673892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3239605600).

2161673892 is an abundant number, since it is smaller than the sum of its proper divisors (4317537308).

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

2161673892 is a wasteful number, since it uses less digits than its factorization.

2161673892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103 (or 3092 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 2161673892 is about 46493.8048776393. The cubic root of 2161673892 is about 1292.9946436328.

The spelling of 2161673892 in words is "two billion, one hundred sixty-one million, six hundred seventy-three thousand, eight hundred ninety-two".