26264715209 has 2 divisors, whose sum is σ = 26264715210. Its totient is φ = 26264715208.

The previous prime is 26264715193. The next prime is 26264715221. The reversal of 26264715209 is 90251746262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22732195984 + 3532519225 = 150772^2 + 59435^2 .

It is a cyclic number.

It is not a de Polignac number, because 26264715209 - 2⁴ = 26264715193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26264715209.

It is not a weakly prime, because it can be changed into another prime (26264715229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13132357604 + 13132357605.

It is an arithmetic number, because the mean of its divisors is an integer number (13132357605).

Almost surely, 2^26264715209 is an apocalyptic number.

It is an amenable number.

26264715209 is a deficient number, since it is larger than the sum of its proper divisors (1).

26264715209 is an equidigital number, since it uses as much as digits as its factorization.

26264715209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 26264715209 in words is "twenty-six billion, two hundred sixty-four million, seven hundred fifteen thousand, two hundred nine".