26781931159 has 2 divisors, whose sum is σ = 26781931160. Its totient is φ = 26781931158.

The previous prime is 26781931157. The next prime is 26781931237. The reversal of 26781931159 is 95113918762.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26781931159 - 2¹ = 26781931157 is a prime.

Together with 26781931157, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26781931157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13390965579 + 13390965580.

It is an arithmetic number, because the mean of its divisors is an integer number (13390965580).

Almost surely, 2^26781931159 is an apocalyptic number.

26781931159 is a deficient number, since it is larger than the sum of its proper divisors (1).

26781931159 is an equidigital number, since it uses as much as digits as its factorization.

26781931159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The spelling of 26781931159 in words is "twenty-six billion, seven hundred eighty-one million, nine hundred thirty-one thousand, one hundred fifty-nine".