26642643393893 has 2 divisors, whose sum is σ = 26642643393894. Its totient is φ = 26642643393892.

The previous prime is 26642643393833. The next prime is 26642643393917. The reversal of 26642643393893 is 39839334624662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22915589202529 + 3727054191364 = 4787023^2 + 1930558^2 .

It is a cyclic number.

It is not a de Polignac number, because 26642643393893 - 2¹² = 26642643389797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26642643393833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13321321696946 + 13321321696947.

It is an arithmetic number, because the mean of its divisors is an integer number (13321321696947).

Almost surely, 2^{26642643393893} is an apocalyptic number.

It is an amenable number.

26642643393893 is a deficient number, since it is larger than the sum of its proper divisors (1).

26642643393893 is an equidigital number, since it uses as much as digits as its factorization.

26642643393893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725594112, while the sum is 68.

The spelling of 26642643393893 in words is "twenty-six trillion, six hundred forty-two billion, six hundred forty-three million, three hundred ninety-three thousand, eight hundred ninety-three".