2161667984 has 40 divisors (see below), whose sum is σ = 4795282368. Its totient is φ = 924739200.

The previous prime is 2161667971. The next prime is 2161667987. The reversal of 2161667984 is 4897661612.

It is not an unprimeable number, because it can be changed into a prime (2161667987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45059 + ... + 79709.

Almost surely, 2^2161667984 is an apocalyptic number.

It is an amenable number.

2161667984 is an abundant number, since it is smaller than the sum of its proper divisors (2633614384).

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

2161667984 is a wasteful number, since it uses less digits than its factorization.

2161667984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35223 (or 35217 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 2161667984 is about 46493.7413422495. The cubic root of 2161667984 is about 1292.9934656847.

The spelling of 2161667984 in words is "two billion, one hundred sixty-one million, six hundred sixty-seven thousand, nine hundred eighty-four".