2161999983995 has 16 divisors (see below), whose sum is σ = 2643974578560. Its totient is φ = 1696829157504.

The previous prime is 2161999983953. The next prime is 2161999984031. The reversal of 2161999983995 is 5993899991612.

It is a cyclic number.

It is not a de Polignac number, because 2161999983995 - 2²⁰ = 2161998935419 is a prime.

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, 17369252 + ... + 17493281.

It is an arithmetic number, because the mean of its divisors is an integer number (165248411160).

Almost surely, 2^{2161999983995} is an apocalyptic number.

2161999983995 is a deficient number, since it is larger than the sum of its proper divisors (481974594565).

2161999983995 is a wasteful number, since it uses less digits than its factorization.

2161999983995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34862774.

The product of its digits is 765275040, while the sum is 80.

The spelling of 2161999983995 in words is "two trillion, one hundred sixty-one billion, nine hundred ninety-nine million, nine hundred eighty-three thousand, nine hundred ninety-five".