26238728909 has 2 divisors, whose sum is σ = 26238728910. Its totient is φ = 26238728908.

The previous prime is 26238728899. The next prime is 26238728947. The reversal of 26238728909 is 90982783262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22536614884 + 3702114025 = 150122^2 + 60845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26238728909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26238728609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13119364454 + 13119364455.

It is an arithmetic number, because the mean of its divisors is an integer number (13119364455).

Almost surely, 2^26238728909 is an apocalyptic number.

It is an amenable number.

26238728909 is a deficient number, since it is larger than the sum of its proper divisors (1).

26238728909 is an equidigital number, since it uses as much as digits as its factorization.

26238728909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 26238728909 in words is "twenty-six billion, two hundred thirty-eight million, seven hundred twenty-eight thousand, nine hundred nine".