26345640193 has 2 divisors, whose sum is σ = 26345640194. Its totient is φ = 26345640192.

The previous prime is 26345640187. The next prime is 26345640257. The reversal of 26345640193 is 39104654362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25846028289 + 499611904 = 160767^2 + 22352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26345640193 is a prime.

It is not a weakly prime, because it can be changed into another prime (26345640143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13172820096 + 13172820097.

It is an arithmetic number, because the mean of its divisors is an integer number (13172820097).

Almost surely, 2^26345640193 is an apocalyptic number.

It is an amenable number.

26345640193 is a deficient number, since it is larger than the sum of its proper divisors (1).

26345640193 is an equidigital number, since it uses as much as digits as its factorization.

26345640193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 26345640193 in words is "twenty-six billion, three hundred forty-five million, six hundred forty thousand, one hundred ninety-three".