26115566639 has 2 divisors, whose sum is σ = 26115566640. Its totient is φ = 26115566638.

The previous prime is 26115566621. The next prime is 26115566749. The reversal of 26115566639 is 93666551162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26115566639 - 2⁸ = 26115566383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26115566339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13057783319 + 13057783320.

It is an arithmetic number, because the mean of its divisors is an integer number (13057783320).

Almost surely, 2^26115566639 is an apocalyptic number.

26115566639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26115566639 is an equidigital number, since it uses as much as digits as its factorization.

26115566639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 50.

The spelling of 26115566639 in words is "twenty-six billion, one hundred fifteen million, five hundred sixty-six thousand, six hundred thirty-nine".