26110357981 has 2 divisors, whose sum is σ = 26110357982. Its totient is φ = 26110357980.

The previous prime is 26110357979. The next prime is 26110358009. The reversal of 26110357981 is 18975301162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25363429081 + 746928900 = 159259^2 + 27330^2 .

It is a cyclic number.

It is not a de Polignac number, because 26110357981 - 2¹ = 26110357979 is a prime.

It is a super-2 number, since 2×26110357981² (a number of 22 digits) contains 22 as substring.

Together with 26110357979, 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 (26110357921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13055178990 + 13055178991.

It is an arithmetic number, because the mean of its divisors is an integer number (13055178991).

Almost surely, 2^26110357981 is an apocalyptic number.

It is an amenable number.

26110357981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26110357981 is an equidigital number, since it uses as much as digits as its factorization.

26110357981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 26110357981 in words is "twenty-six billion, one hundred ten million, three hundred fifty-seven thousand, nine hundred eighty-one".