26512919989 has 2 divisors, whose sum is σ = 26512919990. Its totient is φ = 26512919988.

The previous prime is 26512919957. The next prime is 26512920023. The reversal of 26512919989 is 98991921562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23772397489 + 2740522500 = 154183^2 + 52350^2 .

It is a cyclic number.

It is not a de Polignac number, because 26512919989 - 2⁵ = 26512919957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26512919089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13256459994 + 13256459995.

It is an arithmetic number, because the mean of its divisors is an integer number (13256459995).

Almost surely, 2^26512919989 is an apocalyptic number.

It is an amenable number.

26512919989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26512919989 is an equidigital number, since it uses as much as digits as its factorization.

26512919989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6298560, while the sum is 61.

The spelling of 26512919989 in words is "twenty-six billion, five hundred twelve million, nine hundred nineteen thousand, nine hundred eighty-nine".