26564140991 has 2 divisors, whose sum is σ = 26564140992. Its totient is φ = 26564140990.

The previous prime is 26564140951. The next prime is 26564141017. The reversal of 26564140991 is 19904146562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26564140991 - 2¹⁴ = 26564124607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26564140951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13282070495 + 13282070496.

It is an arithmetic number, because the mean of its divisors is an integer number (13282070496).

Almost surely, 2^26564140991 is an apocalyptic number.

26564140991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26564140991 is an equidigital number, since it uses as much as digits as its factorization.

26564140991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 26564140991 in words is "twenty-six billion, five hundred sixty-four million, one hundred forty thousand, nine hundred ninety-one".