26561103116523 has 64 divisors (see below), whose sum is σ = 36781250135040. Its totient is φ = 17038840665600.

The previous prime is 26561103116497. The next prime is 26561103116539. The reversal of 26561103116523 is 32561130116562.

It is a happy number.

It is not a de Polignac number, because 26561103116523 - 2¹⁷ = 26561102985451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26561103116323) 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 63 ways as a sum of consecutive naturals, for example, 6417273388 + ... + 6417277526.

It is an arithmetic number, because the mean of its divisors is an integer number (574707033360).

Almost surely, 2^{26561103116523} is an apocalyptic number.

26561103116523 is a deficient number, since it is larger than the sum of its proper divisors (10220147018517).

26561103116523 is a wasteful number, since it uses less digits than its factorization.

26561103116523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6020.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 26561103116523 in words is "twenty-six trillion, five hundred sixty-one billion, one hundred three million, one hundred sixteen thousand, five hundred twenty-three".