26401663837 has 2 divisors, whose sum is σ = 26401663838. Its totient is φ = 26401663836.

The previous prime is 26401663811. The next prime is 26401663877. The reversal of 26401663837 is 73836610462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23478207076 + 2923456761 = 153226^2 + 54069^2 .

It is a cyclic number.

It is not a de Polignac number, because 26401663837 - 2⁷ = 26401663709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26401663877) 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, 13200831918 + 13200831919.

It is an arithmetic number, because the mean of its divisors is an integer number (13200831919).

Almost surely, 2^26401663837 is an apocalyptic number.

It is an amenable number.

26401663837 is a deficient number, since it is larger than the sum of its proper divisors (1).

26401663837 is an equidigital number, since it uses as much as digits as its factorization.

26401663837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 26401663837 in words is "twenty-six billion, four hundred one million, six hundred sixty-three thousand, eight hundred thirty-seven".