26578489417489 has 3 divisors (see below), whose sum is σ = 26578494572923. Its totient is φ = 26578484262056.

The previous prime is 26578489417481. The next prime is 26578489417511. The reversal of 26578489417489 is 98471498487562.

It is a happy number.

The square root of 26578489417489 is 5155433.

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., 21523150883025 + 5055338534464 = 4639305^2 + 2248408^2 .

It is not a de Polignac number, because 26578489417489 - 2³ = 26578489417481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26578489417481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2577717 + ... + 7733149.

Almost surely, 2^{26578489417489} is an apocalyptic number.

26578489417489 is the 5155433-rd square number.

26578489417489 is the 2577717-th centered octagonal number.

It is an amenable number.

26578489417489 is a deficient number, since it is larger than the sum of its proper divisors (5155434).

26578489417489 is an frugal number, since it uses more digits than its factorization.

26578489417489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310866 (or 5155433 counting only the distinct ones).

The product of its digits is 7803371520, while the sum is 82.

The spelling of 26578489417489 in words is "twenty-six trillion, five hundred seventy-eight billion, four hundred eighty-nine million, four hundred seventeen thousand, four hundred eighty-nine".