26638345985 has 4 divisors (see below), whose sum is σ = 31966015188. Its totient is φ = 21310676784.

The previous prime is 26638345961. The next prime is 26638346071. The reversal of 26638345985 is 58954383662.

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 8701904656 + 17936441329 = 93284^2 + 133927^2 .

It is a cyclic number.

It is not a de Polignac number, because 26638345985 - 2²² = 26634151681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2663834594 + ... + 2663834603.

It is an arithmetic number, because the mean of its divisors is an integer number (7991503797).

Almost surely, 2^26638345985 is an apocalyptic number.

It is an amenable number.

26638345985 is a deficient number, since it is larger than the sum of its proper divisors (5327669203).

26638345985 is an equidigital number, since it uses as much as digits as its factorization.

26638345985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327669202.

The product of its digits is 37324800, while the sum is 59.

The spelling of 26638345985 in words is "twenty-six billion, six hundred thirty-eight million, three hundred forty-five thousand, nine hundred eighty-five".