26213709817 has 2 divisors, whose sum is σ = 26213709818. Its totient is φ = 26213709816.

The previous prime is 26213709787. The next prime is 26213709871. The reversal of 26213709817 is 71890731262.

Together with next prime (26213709871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18195581881 + 8018127936 = 134891^2 + 89544^2 .

It is a cyclic number.

It is not a de Polignac number, because 26213709817 - 2²³ = 26205321209 is a prime.

It is not a weakly prime, because it can be changed into another prime (26213799817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13106854908 + 13106854909.

It is an arithmetic number, because the mean of its divisors is an integer number (13106854909).

Almost surely, 2^26213709817 is an apocalyptic number.

It is an amenable number.

26213709817 is a deficient number, since it is larger than the sum of its proper divisors (1).

26213709817 is an equidigital number, since it uses as much as digits as its factorization.

26213709817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 26213709817 in words is "twenty-six billion, two hundred thirteen million, seven hundred nine thousand, eight hundred seventeen".