26811584197 has 2 divisors, whose sum is σ = 26811584198. Its totient is φ = 26811584196.

The previous prime is 26811584183. The next prime is 26811584201. The reversal of 26811584197 is 79148511862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21472213156 + 5339371041 = 146534^2 + 73071^2 .

It is a cyclic number.

It is not a de Polignac number, because 26811584197 - 2¹⁹ = 26811059909 is a prime.

It is a super-2 number, since 2×26811584197² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26811584117) 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, 13405792098 + 13405792099.

It is an arithmetic number, because the mean of its divisors is an integer number (13405792099).

Almost surely, 2^26811584197 is an apocalyptic number.

It is an amenable number.

26811584197 is a deficient number, since it is larger than the sum of its proper divisors (1).

26811584197 is an equidigital number, since it uses as much as digits as its factorization.

26811584197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 52.

The spelling of 26811584197 in words is "twenty-six billion, eight hundred eleven million, five hundred eighty-four thousand, one hundred ninety-seven".