26189259949 has 2 divisors, whose sum is σ = 26189259950. Its totient is φ = 26189259948.

The previous prime is 26189259937. The next prime is 26189259953. The reversal of 26189259949 is 94995298162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25793966025 + 395293924 = 160605^2 + 19882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26189259949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26189259979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13094629974 + 13094629975.

It is an arithmetic number, because the mean of its divisors is an integer number (13094629975).

Almost surely, 2^26189259949 is an apocalyptic number.

It is an amenable number.

26189259949 is a deficient number, since it is larger than the sum of its proper divisors (1).

26189259949 is an equidigital number, since it uses as much as digits as its factorization.

26189259949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25194240, while the sum is 64.

The spelling of 26189259949 in words is "twenty-six billion, one hundred eighty-nine million, two hundred fifty-nine thousand, nine hundred forty-nine".