26439088691 has 2 divisors, whose sum is σ = 26439088692. Its totient is φ = 26439088690.

The previous prime is 26439088679. The next prime is 26439088733. The reversal of 26439088691 is 19688093462.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26439088691 - 2¹⁴ = 26439072307 is a prime.

It is not a weakly prime, because it can be changed into another prime (26439088651) 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, 13219544345 + 13219544346.

It is an arithmetic number, because the mean of its divisors is an integer number (13219544346).

Almost surely, 2^26439088691 is an apocalyptic number.

26439088691 is a deficient number, since it is larger than the sum of its proper divisors (1).

26439088691 is an equidigital number, since it uses as much as digits as its factorization.

26439088691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 26439088691 in words is "twenty-six billion, four hundred thirty-nine million, eighty-eight thousand, six hundred ninety-one".