26778752876549 has 2 divisors, whose sum is σ = 26778752876550. Its totient is φ = 26778752876548.

The previous prime is 26778752876503. The next prime is 26778752876587. The reversal of 26778752876549 is 94567825787762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18488125247524 + 8290627629025 = 4299782^2 + 2879345^2 .

It is a cyclic number.

It is not a de Polignac number, because 26778752876549 - 2²⁰ = 26778751827973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26778752876749) 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, 13389376438274 + 13389376438275.

It is an arithmetic number, because the mean of its divisors is an integer number (13389376438275).

Almost surely, 2^{26778752876549} is an apocalyptic number.

It is an amenable number.

26778752876549 is a deficient number, since it is larger than the sum of its proper divisors (1).

26778752876549 is an equidigital number, since it uses as much as digits as its factorization.

26778752876549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19914854400, while the sum is 83.

The spelling of 26778752876549 in words is "twenty-six trillion, seven hundred seventy-eight billion, seven hundred fifty-two million, eight hundred seventy-six thousand, five hundred forty-nine".