26442307665 has 24 divisors (see below), whose sum is σ = 46167893928. Its totient is φ = 13999622400.

The previous prime is 26442307663. The next prime is 26442307747. The reversal of 26442307665 is 56670324462.

It can be written as a sum of positive squares in 4 ways, for example, as 6415529409 + 20026778256 = 80097^2 + 141516^2 .

It is not a de Polignac number, because 26442307665 - 2¹ = 26442307663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 26442307665.

It is not an unprimeable number, because it can be changed into a prime (26442307663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2138386 + ... + 2150715.

It is an arithmetic number, because the mean of its divisors is an integer number (1923662247).

Almost surely, 2^26442307665 is an apocalyptic number.

It is an amenable number.

26442307665 is a deficient number, since it is larger than the sum of its proper divisors (19725586263).

26442307665 is a wasteful number, since it uses less digits than its factorization.

26442307665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289249 (or 4289246 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 45.

The spelling of 26442307665 in words is "twenty-six billion, four hundred forty-two million, three hundred seven thousand, six hundred sixty-five".