2165981671363 has 4 divisors (see below), whose sum is σ = 2172525422968. Its totient is φ = 2159437919760.

The previous prime is 2165981671361. The next prime is 2165981671391. The reversal of 2165981671363 is 3631761895612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2165981671363 - 2¹ = 2165981671361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165981671298 and 2165981671307.

It is not an unprimeable number, because it can be changed into a prime (2165981671361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3271875306 + ... + 3271875967.

It is an arithmetic number, because the mean of its divisors is an integer number (543131355742).

Almost surely, 2^{2165981671363} is an apocalyptic number.

2165981671363 is a deficient number, since it is larger than the sum of its proper divisors (6543751605).

2165981671363 is an equidigital number, since it uses as much as digits as its factorization.

2165981671363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6543751604.

The product of its digits is 9797760, while the sum is 58.

The spelling of 2165981671363 in words is "two trillion, one hundred sixty-five billion, nine hundred eighty-one million, six hundred seventy-one thousand, three hundred sixty-three".