26698643387329 has 9 divisors (see below), whose sum is σ = 27002463862377. Its totient is φ = 26398203927744.

The previous prime is 26698643387327. The next prime is 26698643387359. The reversal of 26698643387329 is 92378334689662.

The square root of 26698643387329 is 5167073.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3419485164225 + 23279158223104 = 1849185^2 + 4824848^2 .

It is not a de Polignac number, because 26698643387329 - 2¹ = 26698643387327 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26698643387327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 459840469 + ... + 459898525.

Almost surely, 2^{26698643387329} is an apocalyptic number.

26698643387329 is the 5167073-rd square number.

26698643387329 is the 2583537-th centered octagonal number.

It is an amenable number.

26698643387329 is a deficient number, since it is larger than the sum of its proper divisors (303820475048).

26698643387329 is an frugal number, since it uses more digits than its factorization.

26698643387329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116292 (or 58146 counting only the distinct ones).

The product of its digits is 3386105856, while the sum is 76.

The spelling of 26698643387329 in words is "twenty-six trillion, six hundred ninety-eight billion, six hundred forty-three million, three hundred eighty-seven thousand, three hundred twenty-nine".