26561747972864 has 36 divisors (see below), whose sum is σ = 57098180595456. Its totient is φ = 12259268293632.

The previous prime is 26561747972849. The next prime is 26561747972917. The reversal of 26561747972864 is 46827974716562.

It is a junction number, because it is equal to n+sod(n) for n = 26561747972791 and 26561747972800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3990643904 + ... + 3990650559.

It is an arithmetic number, because the mean of its divisors is an integer number (1586060572096).

Almost surely, 2^{26561747972864} is an apocalyptic number.

It is an amenable number.

26561747972864 is an abundant number, since it is smaller than the sum of its proper divisors (30536432622592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26561747972864 is an equidigital number, since it uses as much as digits as its factorization.

26561747972864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7981294492 (or 7981294478 counting only the distinct ones).

The product of its digits is 1706987520, while the sum is 74.

The spelling of 26561747972864 in words is "twenty-six trillion, five hundred sixty-one billion, seven hundred forty-seven million, nine hundred seventy-two thousand, eight hundred sixty-four".