26020778261 has 2 divisors, whose sum is σ = 26020778262. Its totient is φ = 26020778260.

The previous prime is 26020778243. The next prime is 26020778263. The reversal of 26020778261 is 16287702062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25513672900 + 507105361 = 159730^2 + 22519^2 .

It is a cyclic number.

It is not a de Polignac number, because 26020778261 - 2³⁰ = 24947036437 is a prime.

Together with 26020778263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26020778263) 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, 13010389130 + 13010389131.

It is an arithmetic number, because the mean of its divisors is an integer number (13010389131).

Almost surely, 2^26020778261 is an apocalyptic number.

It is an amenable number.

26020778261 is a deficient number, since it is larger than the sum of its proper divisors (1).

26020778261 is an equidigital number, since it uses as much as digits as its factorization.

26020778261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 26020778261 in words is "twenty-six billion, twenty million, seven hundred seventy-eight thousand, two hundred sixty-one".