26288974697 has 2 divisors, whose sum is σ = 26288974698. Its totient is φ = 26288974696.

The previous prime is 26288974669. The next prime is 26288974721. The reversal of 26288974697 is 79647988262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17954928016 + 8334046681 = 133996^2 + 91291^2 .

It is a cyclic number.

It is not a de Polignac number, because 26288974697 - 2¹² = 26288970601 is a prime.

It is a super-2 number, since 2×26288974697² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26288974627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13144487348 + 13144487349.

It is an arithmetic number, because the mean of its divisors is an integer number (13144487349).

Almost surely, 2^26288974697 is an apocalyptic number.

It is an amenable number.

26288974697 is a deficient number, since it is larger than the sum of its proper divisors (1).

26288974697 is an equidigital number, since it uses as much as digits as its factorization.

26288974697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 146313216, while the sum is 68.

The spelling of 26288974697 in words is "twenty-six billion, two hundred eighty-eight million, nine hundred seventy-four thousand, six hundred ninety-seven".