26365561 has 2 divisors, whose sum is σ = 26365562. Its totient is φ = 26365560.

The previous prime is 26365541. The next prime is 26365601. The reversal of 26365561 is 16556362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21678336 + 4687225 = 4656^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 26365561 - 2⁹ = 26365049 is a prime.

It is not a weakly prime, because it can be changed into another prime (26365511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13182780 + 13182781.

It is an arithmetic number, because the mean of its divisors is an integer number (13182781).

Almost surely, 2^26365561 is an apocalyptic number.

It is an amenable number.

26365561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26365561 is an equidigital number, since it uses as much as digits as its factorization.

26365561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 26365561 is about 5134.7405971480. The cubic root of 26365561 is about 297.6315770404.

The spelling of 26365561 in words is "twenty-six million, three hundred sixty-five thousand, five hundred sixty-one".