26500013909 has 2 divisors, whose sum is σ = 26500013910. Its totient is φ = 26500013908.

The previous prime is 26500013879. The next prime is 26500013921. The reversal of 26500013909 is 90931000562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14459341009 + 12040672900 = 120247^2 + 109730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26500013909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26500013959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13250006954 + 13250006955.

It is an arithmetic number, because the mean of its divisors is an integer number (13250006955).

Almost surely, 2^26500013909 is an apocalyptic number.

It is an amenable number.

26500013909 is a deficient number, since it is larger than the sum of its proper divisors (1).

26500013909 is an equidigital number, since it uses as much as digits as its factorization.

26500013909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The spelling of 26500013909 in words is "twenty-six billion, five hundred million, thirteen thousand, nine hundred nine".