26549693189 has 2 divisors, whose sum is σ = 26549693190. Its totient is φ = 26549693188.

The previous prime is 26549693167. The next prime is 26549693207. The reversal of 26549693189 is 98139694562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24221630689 + 2328062500 = 155633^2 + 48250^2 .

It is a cyclic number.

It is not a de Polignac number, because 26549693189 - 2³² = 22254725893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26549693119) 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, 13274846594 + 13274846595.

It is an arithmetic number, because the mean of its divisors is an integer number (13274846595).

Almost surely, 2^26549693189 is an apocalyptic number.

It is an amenable number.

26549693189 is a deficient number, since it is larger than the sum of its proper divisors (1).

26549693189 is an equidigital number, since it uses as much as digits as its factorization.

26549693189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25194240, while the sum is 62.

The spelling of 26549693189 in words is "twenty-six billion, five hundred forty-nine million, six hundred ninety-three thousand, one hundred eighty-nine".