26648484661 has 2 divisors, whose sum is σ = 26648484662. Its totient is φ = 26648484660.

The previous prime is 26648484649. The next prime is 26648484671. The reversal of 26648484661 is 16648484662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26542600561 + 105884100 = 162919^2 + 10290^2 .

It is a cyclic number.

It is not a de Polignac number, because 26648484661 - 2²³ = 26640096053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26648484631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13324242330 + 13324242331.

It is an arithmetic number, because the mean of its divisors is an integer number (13324242331).

Almost surely, 2^26648484661 is an apocalyptic number.

It is an amenable number.

26648484661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26648484661 is an equidigital number, since it uses as much as digits as its factorization.

26648484661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10616832, while the sum is 55.

Subtracting from 26648484661 its reverse (16648484662), we obtain a palindrome (9999999999).

The spelling of 26648484661 in words is "twenty-six billion, six hundred forty-eight million, four hundred eighty-four thousand, six hundred sixty-one".