26105369509 has 2 divisors, whose sum is σ = 26105369510. Its totient is φ = 26105369508.

The previous prime is 26105369453. The next prime is 26105369513. The reversal of 26105369509 is 90596350162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22170316609 + 3935052900 = 148897^2 + 62730^2 .

It is a cyclic number.

It is not a de Polignac number, because 26105369509 - 2²⁷ = 25971151781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26105369519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13052684754 + 13052684755.

It is an arithmetic number, because the mean of its divisors is an integer number (13052684755).

Almost surely, 2^26105369509 is an apocalyptic number.

It is an amenable number.

26105369509 is a deficient number, since it is larger than the sum of its proper divisors (1).

26105369509 is an equidigital number, since it uses as much as digits as its factorization.

26105369509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 437400, while the sum is 46.

The spelling of 26105369509 in words is "twenty-six billion, one hundred five million, three hundred sixty-nine thousand, five hundred nine".