2164644843247 has 4 divisors (see below), whose sum is σ = 2181168849816. Its totient is φ = 2148120836680.

The previous prime is 2164644843203. The next prime is 2164644843281. The reversal of 2164644843247 is 7423484464612.

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 2164644843247 - 2¹⁹ = 2164644318959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164644843287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8262003088 + ... + 8262003349.

It is an arithmetic number, because the mean of its divisors is an integer number (545292212454).

Almost surely, 2^{2164644843247} is an apocalyptic number.

2164644843247 is a deficient number, since it is larger than the sum of its proper divisors (16524006569).

2164644843247 is a wasteful number, since it uses less digits than its factorization.

2164644843247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16524006568.

The product of its digits is 24772608, while the sum is 55.

The spelling of 2164644843247 in words is "two trillion, one hundred sixty-four billion, six hundred forty-four million, eight hundred forty-three thousand, two hundred forty-seven".