2638778371 has 2 divisors, whose sum is σ = 2638778372. Its totient is φ = 2638778370.

The previous prime is 2638778347. The next prime is 2638778381. The reversal of 2638778371 is 1738778362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2638778371 - 2¹⁹ = 2638254083 is a prime.

It is not a weakly prime, because it can be changed into another prime (2638778341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319389185 + 1319389186.

It is an arithmetic number, because the mean of its divisors is an integer number (1319389186).

Almost surely, 2^2638778371 is an apocalyptic number.

2638778371 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638778371 is an equidigital number, since it uses as much as digits as its factorization.

2638778371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 52.

The square root of 2638778371 is about 51369.0409780054. The cubic root of 2638778371 is about 1381.8714319645.

Subtracting from 2638778371 its reverse (1738778362), we obtain a palindrome (900000009).

The spelling of 2638778371 in words is "two billion, six hundred thirty-eight million, seven hundred seventy-eight thousand, three hundred seventy-one".