26274516557 has 2 divisors, whose sum is σ = 26274516558. Its totient is φ = 26274516556.

The previous prime is 26274516511. The next prime is 26274516589. The reversal of 26274516557 is 75561547262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26181181636 + 93334921 = 161806^2 + 9661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26274516557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26274516157) 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, 13137258278 + 13137258279.

It is an arithmetic number, because the mean of its divisors is an integer number (13137258279).

Almost surely, 2^26274516557 is an apocalyptic number.

It is an amenable number.

26274516557 is a deficient number, since it is larger than the sum of its proper divisors (1).

26274516557 is an equidigital number, since it uses as much as digits as its factorization.

26274516557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528000, while the sum is 50.

The spelling of 26274516557 in words is "twenty-six billion, two hundred seventy-four million, five hundred sixteen thousand, five hundred fifty-seven".