26561506774 has 32 divisors (see below), whose sum is σ = 44637350400. Its totient is φ = 11750435040.

The previous prime is 26561506771. The next prime is 26561506781. The reversal of 26561506774 is 47760516562.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26561506771) 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 15 ways as a sum of consecutive naturals, for example, 113332 + ... + 256840.

It is an arithmetic number, because the mean of its divisors is an integer number (1394917200).

Almost surely, 2^26561506774 is an apocalyptic number.

26561506774 is a deficient number, since it is larger than the sum of its proper divisors (18075843626).

26561506774 is a wasteful number, since it uses less digits than its factorization.

26561506774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143748.

The product of its (nonzero) digits is 2116800, while the sum is 49.

It can be divided in two parts, 26561 and 506774, that added together give a palindrome (533335).

The spelling of 26561506774 in words is "twenty-six billion, five hundred sixty-one million, five hundred six thousand, seven hundred seventy-four".