26218547209 has 4 divisors (see below), whose sum is σ = 26409923604. Its totient is φ = 26027170816.

The previous prime is 26218547191. The next prime is 26218547219. The reversal of 26218547209 is 90274581262.

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 11865309184 + 14353238025 = 108928^2 + 119805^2 .

It is a cyclic number.

It is not a de Polignac number, because 26218547209 - 2¹⁹ = 26218022921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26218547219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95687992 + ... + 95688265.

It is an arithmetic number, because the mean of its divisors is an integer number (6602480901).

Almost surely, 2^26218547209 is an apocalyptic number.

It is an amenable number.

26218547209 is a deficient number, since it is larger than the sum of its proper divisors (191376395).

26218547209 is a wasteful number, since it uses less digits than its factorization.

26218547209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191376394.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 26218547209 in words is "twenty-six billion, two hundred eighteen million, five hundred forty-seven thousand, two hundred nine".