26642607209 has 2 divisors, whose sum is σ = 26642607210. Its totient is φ = 26642607208.

The previous prime is 26642607181. The next prime is 26642607287. The reversal of 26642607209 is 90270624662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22822749184 + 3819858025 = 151072^2 + 61805^2 .

It is a cyclic number.

It is not a de Polignac number, because 26642607209 - 2²⁸ = 26374171753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26642607209.

It is not a weakly prime, because it can be changed into another prime (26642607289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13321303604 + 13321303605.

It is an arithmetic number, because the mean of its divisors is an integer number (13321303605).

Almost surely, 2^26642607209 is an apocalyptic number.

It is an amenable number.

26642607209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26642607209 is an equidigital number, since it uses as much as digits as its factorization.

26642607209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 26642607209 in words is "twenty-six billion, six hundred forty-two million, six hundred seven thousand, two hundred nine".