26698080817 has 2 divisors, whose sum is σ = 26698080818. Its totient is φ = 26698080816.

The previous prime is 26698080811. The next prime is 26698080853. The reversal of 26698080817 is 71808089662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20208328336 + 6489752481 = 142156^2 + 80559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26698080817 is a prime.

It is a super-2 number, since 2×26698080817² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26698080811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13349040408 + 13349040409.

It is an arithmetic number, because the mean of its divisors is an integer number (13349040409).

Almost surely, 2^26698080817 is an apocalyptic number.

It is an amenable number.

26698080817 is a deficient number, since it is larger than the sum of its proper divisors (1).

26698080817 is an equidigital number, since it uses as much as digits as its factorization.

26698080817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 26698080817 in words is "twenty-six billion, six hundred ninety-eight million, eighty thousand, eight hundred seventeen".