26740636738561 has 16 divisors (see below), whose sum is σ = 27645056835840. Its totient is φ = 25846077438720.

The previous prime is 26740636738553. The next prime is 26740636738579. The reversal of 26740636738561 is 16583763604762.

It is a cyclic number.

It is not a de Polignac number, because 26740636738561 - 2³ = 26740636738553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26740636738493 and 26740636738502.

It is not an unprimeable number, because it can be changed into a prime (26740636738511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4404376 + ... + 8536966.

It is an arithmetic number, because the mean of its divisors is an integer number (1727816052240).

Almost surely, 2^{26740636738561} is an apocalyptic number.

It is an amenable number.

26740636738561 is a deficient number, since it is larger than the sum of its proper divisors (904420097279).

26740636738561 is a wasteful number, since it uses less digits than its factorization.

26740636738561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4133784.

The product of its (nonzero) digits is 182891520, while the sum is 64.

It can be divided in two parts, 2674063 and 6738561, that added together give a square (9412624 = 3068²).

The spelling of 26740636738561 in words is "twenty-six trillion, seven hundred forty billion, six hundred thirty-six million, seven hundred thirty-eight thousand, five hundred sixty-one".