26844688666505 has 16 divisors (see below), whose sum is σ = 32656384702224. Its totient is φ = 21180605322240.

The previous prime is 26844688666451. The next prime is 26844688666517. The reversal of 26844688666505 is 50566688644862.

It can be written as a sum of positive squares in 8 ways, for example, as 1629156115456 + 25215532551049 = 1276384^2 + 5021507^2 .

It is not a de Polignac number, because 26844688666505 - 2⁶ = 26844688666441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 6480365 + ... + 9781845.

It is an arithmetic number, because the mean of its divisors is an integer number (2041024043889).

Almost surely, 2^{26844688666505} is an apocalyptic number.

It is an amenable number.

26844688666505 is a deficient number, since it is larger than the sum of its proper divisors (5811696035719).

26844688666505 is a wasteful number, since it uses less digits than its factorization.

26844688666505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323836.

The product of its (nonzero) digits is 3185049600, while the sum is 74.

The spelling of 26844688666505 in words is "twenty-six trillion, eight hundred forty-four billion, six hundred eighty-eight million, six hundred sixty-six thousand, five hundred five".