26393557649 has 2 divisors, whose sum is σ = 26393557650. Its totient is φ = 26393557648.

The previous prime is 26393557643. The next prime is 26393557733. The reversal of 26393557649 is 94675539362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23396761600 + 2996796049 = 152960^2 + 54743^2 .

It is a cyclic number.

It is not a de Polignac number, because 26393557649 - 2²⁴ = 26376780433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26393557643) 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, 13196778824 + 13196778825.

It is an arithmetic number, because the mean of its divisors is an integer number (13196778825).

Almost surely, 2^26393557649 is an apocalyptic number.

It is an amenable number.

26393557649 is a deficient number, since it is larger than the sum of its proper divisors (1).

26393557649 is an equidigital number, since it uses as much as digits as its factorization.

26393557649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36741600, while the sum is 59.

The spelling of 26393557649 in words is "twenty-six billion, three hundred ninety-three million, five hundred fifty-seven thousand, six hundred forty-nine".