26745787886689 has 3 divisors (see below), whose sum is σ = 26745793058323. Its totient is φ = 26745782715056.

The previous prime is 26745787886687. The next prime is 26745787886731. The reversal of 26745787886689 is 98668878754762.

It is a happy number.

The square root of 26745787886689 is 5171633.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3266026056225 + 23479761830464 = 1807215^2 + 4845592^2 .

It is not a de Polignac number, because 26745787886689 - 2¹ = 26745787886687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26745787886683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2585817 + ... + 7757449.

Almost surely, 2^{26745787886689} is an apocalyptic number.

26745787886689 is the 5171633-rd square number.

26745787886689 is the 2585817-th centered octagonal number.

It is an amenable number.

26745787886689 is a deficient number, since it is larger than the sum of its proper divisors (5171634).

26745787886689 is an frugal number, since it uses more digits than its factorization.

26745787886689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343266 (or 5171633 counting only the distinct ones).

The product of its digits is 109247201280, while the sum is 91.

The spelling of 26745787886689 in words is "twenty-six trillion, seven hundred forty-five billion, seven hundred eighty-seven million, eight hundred eighty-six thousand, six hundred eighty-nine".