2164636123999 has 4 divisors (see below), whose sum is σ = 2223139803064. Its totient is φ = 2106132444936.

The previous prime is 2164636123987. The next prime is 2164636124009. The reversal of 2164636123999 is 9993216364612.

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 2164636123999 - 2¹⁷ = 2164635992927 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 (2164636103999) 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, 29251839477 + ... + 29251839550.

It is an arithmetic number, because the mean of its divisors is an integer number (555784950766).

Almost surely, 2^{2164636123999} is an apocalyptic number.

2164636123999 is a deficient number, since it is larger than the sum of its proper divisors (58503679065).

2164636123999 is an equidigital number, since it uses as much as digits as its factorization.

2164636123999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58503679064.

The product of its digits is 22674816, while the sum is 61.

The spelling of 2164636123999 in words is "two trillion, one hundred sixty-four billion, six hundred thirty-six million, one hundred twenty-three thousand, nine hundred ninety-nine".