2165981671297 has 8 divisors (see below), whose sum is σ = 2168144353440. Its totient is φ = 2163819184800.

The previous prime is 2165981671277. The next prime is 2165981671331. The reversal of 2165981671297 is 7921761895612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165981671297 - 2¹⁹ = 2165981147009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165981671277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33224229 + ... + 33289357.

It is an arithmetic number, because the mean of its divisors is an integer number (271018044180).

Almost surely, 2^{2165981671297} is an apocalyptic number.

It is an amenable number.

2165981671297 is a deficient number, since it is larger than the sum of its proper divisors (2162682143).

2165981671297 is a wasteful number, since it uses less digits than its factorization.

2165981671297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97823.

The product of its digits is 22861440, while the sum is 64.

The spelling of 2165981671297 in words is "two trillion, one hundred sixty-five billion, nine hundred eighty-one million, six hundred seventy-one thousand, two hundred ninety-seven".