26491663199 has 2 divisors, whose sum is σ = 26491663200. Its totient is φ = 26491663198.

The previous prime is 26491663169. The next prime is 26491663249. The reversal of 26491663199 is 99136619462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26491663199 - 2¹⁶ = 26491597663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26491663169) 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, 13245831599 + 13245831600.

It is an arithmetic number, because the mean of its divisors is an integer number (13245831600).

Almost surely, 2^26491663199 is an apocalyptic number.

26491663199 is a deficient number, since it is larger than the sum of its proper divisors (1).

26491663199 is an equidigital number, since it uses as much as digits as its factorization.

26491663199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 56.

The spelling of 26491663199 in words is "twenty-six billion, four hundred ninety-one million, six hundred sixty-three thousand, one hundred ninety-nine".