26581842557 has 2 divisors, whose sum is σ = 26581842558. Its totient is φ = 26581842556.

The previous prime is 26581842541. The next prime is 26581842559. The reversal of 26581842557 is 75524818562.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22784694916 + 3797147641 = 150946^2 + 61621^2 .

It is a cyclic number.

It is not a de Polignac number, because 26581842557 - 2⁴ = 26581842541 is a prime.

Together with 26581842559, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 26581842499 and 26581842508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26581842559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13290921278 + 13290921279.

It is an arithmetic number, because the mean of its divisors is an integer number (13290921279).

Almost surely, 2^26581842557 is an apocalyptic number.

It is an amenable number.

26581842557 is a deficient number, since it is larger than the sum of its proper divisors (1).

26581842557 is an equidigital number, since it uses as much as digits as its factorization.

26581842557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376000, while the sum is 53.

The spelling of 26581842557 in words is "twenty-six billion, five hundred eighty-one million, eight hundred forty-two thousand, five hundred fifty-seven".