26344122781 has 2 divisors, whose sum is σ = 26344122782. Its totient is φ = 26344122780.

The previous prime is 26344122769. The next prime is 26344122823. The reversal of 26344122781 is 18722144362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25546907556 + 797215225 = 159834^2 + 28235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26344122781 is a prime.

It is a super-2 number, since 2×26344122781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26344122751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13172061390 + 13172061391.

It is an arithmetic number, because the mean of its divisors is an integer number (13172061391).

Almost surely, 2^26344122781 is an apocalyptic number.

It is an amenable number.

26344122781 is a deficient number, since it is larger than the sum of its proper divisors (1).

26344122781 is an equidigital number, since it uses as much as digits as its factorization.

26344122781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 40.

The spelling of 26344122781 in words is "twenty-six billion, three hundred forty-four million, one hundred twenty-two thousand, seven hundred eighty-one".