26261708509 has 2 divisors, whose sum is σ = 26261708510. Its totient is φ = 26261708508.

The previous prime is 26261708503. The next prime is 26261708513. The reversal of 26261708509 is 90580716262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23364039609 + 2897668900 = 152853^2 + 53830^2 .

It is a cyclic number.

It is not a de Polignac number, because 26261708509 - 2¹¹ = 26261706461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26261708503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13130854254 + 13130854255.

It is an arithmetic number, because the mean of its divisors is an integer number (13130854255).

Almost surely, 2^26261708509 is an apocalyptic number.

It is an amenable number.

26261708509 is a deficient number, since it is larger than the sum of its proper divisors (1).

26261708509 is an equidigital number, since it uses as much as digits as its factorization.

26261708509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 26261708509 in words is "twenty-six billion, two hundred sixty-one million, seven hundred eight thousand, five hundred nine".