26535413581 has 2 divisors, whose sum is σ = 26535413582. Its totient is φ = 26535413580.

The previous prime is 26535413507. The next prime is 26535413599. The reversal of 26535413581 is 18531453562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25642897956 + 892515625 = 160134^2 + 29875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26535413581 is a prime.

It is a super-2 number, since 2×26535413581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26535413981) 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, 13267706790 + 13267706791.

It is an arithmetic number, because the mean of its divisors is an integer number (13267706791).

Almost surely, 2^26535413581 is an apocalyptic number.

It is an amenable number.

26535413581 is a deficient number, since it is larger than the sum of its proper divisors (1).

26535413581 is an equidigital number, since it uses as much as digits as its factorization.

26535413581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

The spelling of 26535413581 in words is "twenty-six billion, five hundred thirty-five million, four hundred thirteen thousand, five hundred eighty-one".