26640239585 has 4 divisors (see below), whose sum is σ = 31968287508. Its totient is φ = 21312191664.

The previous prime is 26640239569. The next prime is 26640239599. The reversal of 26640239585 is 58593204662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12410851216 + 14229388369 = 111404^2 + 119287^2 .

It is a cyclic number.

It is not a de Polignac number, because 26640239585 - 2⁴ = 26640239569 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 3 ways as a sum of consecutive naturals, for example, 2664023954 + ... + 2664023963.

It is an arithmetic number, because the mean of its divisors is an integer number (7992071877).

Almost surely, 2^26640239585 is an apocalyptic number.

It is an amenable number.

26640239585 is a deficient number, since it is larger than the sum of its proper divisors (5328047923).

26640239585 is an equidigital number, since it uses as much as digits as its factorization.

26640239585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328047922.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 26640239585 in words is "twenty-six billion, six hundred forty million, two hundred thirty-nine thousand, five hundred eighty-five".