26809109305 has 32 divisors (see below), whose sum is σ = 36434655360. Its totient is φ = 18758369280.

The previous prime is 26809109267. The next prime is 26809109309. The reversal of 26809109305 is 50390190862.

It is a happy number.

It is not a de Polignac number, because 26809109305 - 2¹⁵ = 26809076537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26809109309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421689 + ... + 481081.

It is an arithmetic number, because the mean of its divisors is an integer number (1138582980).

Almost surely, 2^26809109305 is an apocalyptic number.

It is an amenable number.

26809109305 is a deficient number, since it is larger than the sum of its proper divisors (9625546055).

26809109305 is a wasteful number, since it uses less digits than its factorization.

26809109305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59721.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 26809109305 in words is "twenty-six billion, eight hundred nine million, one hundred nine thousand, three hundred five".