26502640139 has 2 divisors, whose sum is σ = 26502640140. Its totient is φ = 26502640138.

The previous prime is 26502640133. The next prime is 26502640141. The reversal of 26502640139 is 93104620562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26502640139 - 2⁸ = 26502639883 is a prime.

Together with 26502640141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26502640133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13251320069 + 13251320070.

It is an arithmetic number, because the mean of its divisors is an integer number (13251320070).

Almost surely, 2^26502640139 is an apocalyptic number.

26502640139 is a deficient number, since it is larger than the sum of its proper divisors (1).

26502640139 is an equidigital number, since it uses as much as digits as its factorization.

26502640139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 26502640139 in words is "twenty-six billion, five hundred two million, six hundred forty thousand, one hundred thirty-nine".