2638766663875 has 8 divisors (see below), whose sum is σ = 3293180796672. Its totient is φ = 2111013331000.

The previous prime is 2638766663861. The next prime is 2638766663879. The reversal of 2638766663875 is 5783666678362.

It is not a de Polignac number, because 2638766663875 - 2¹⁵ = 2638766631107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2638766663798 and 2638766663807.

It is not an unprimeable number, because it can be changed into a prime (2638766663879) 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 7 ways as a sum of consecutive naturals, for example, 10555066531 + ... + 10555066780.

It is an arithmetic number, because the mean of its divisors is an integer number (411647599584).

Almost surely, 2^{2638766663875} is an apocalyptic number.

2638766663875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2638766663875 is a deficient number, since it is larger than the sum of its proper divisors (654414132797).

2638766663875 is an equidigital number, since it uses as much as digits as its factorization.

2638766663875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21110133326 (or 21110133316 counting only the distinct ones).

The product of its digits is 2194698240, while the sum is 73.

The spelling of 2638766663875 in words is "two trillion, six hundred thirty-eight billion, seven hundred sixty-six million, six hundred sixty-three thousand, eight hundred seventy-five".