2638442856191 has 2 divisors, whose sum is σ = 2638442856192. Its totient is φ = 2638442856190.

The previous prime is 2638442856151. The next prime is 2638442856293. The reversal of 2638442856191 is 1916582448362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2638442856191 - 2³⁸ = 2363564949247 is a prime.

It is a super-2 number, since 2×2638442856191² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2638442856191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638442856151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319221428095 + 1319221428096.

It is an arithmetic number, because the mean of its divisors is an integer number (1319221428096).

Almost surely, 2^{2638442856191} is an apocalyptic number.

2638442856191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638442856191 is an equidigital number, since it uses as much as digits as its factorization.

2638442856191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19906560, while the sum is 59.

The spelling of 2638442856191 in words is "two trillion, six hundred thirty-eight billion, four hundred forty-two million, eight hundred fifty-six thousand, one hundred ninety-one".