26423456561 has 2 divisors, whose sum is σ = 26423456562. Its totient is φ = 26423456560.

The previous prime is 26423456533. The next prime is 26423456567. The reversal of 26423456561 is 16565432462.

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., 25971256336 + 452200225 = 161156^2 + 21265^2 .

It is a cyclic number.

It is not a de Polignac number, because 26423456561 - 2⁶ = 26423456497 is a prime.

It is not a weakly prime, because it can be changed into another prime (26423456567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13211728280 + 13211728281.

It is an arithmetic number, because the mean of its divisors is an integer number (13211728281).

Almost surely, 2^26423456561 is an apocalyptic number.

It is an amenable number.

26423456561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26423456561 is an equidigital number, since it uses as much as digits as its factorization.

26423456561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 44.

The spelling of 26423456561 in words is "twenty-six billion, four hundred twenty-three million, four hundred fifty-six thousand, five hundred sixty-one".