191226664793 has 2 divisors, whose sum is σ = 191226664794. Its totient is φ = 191226664792.

The previous prime is 191226664789. The next prime is 191226664807. The reversal of 191226664793 is 397466622191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168385481104 + 22841183689 = 410348^2 + 151133^2 .

It is a cyclic number.

It is not a de Polignac number, because 191226664793 - 2² = 191226664789 is a prime.

It is not a weakly prime, because it can be changed into another prime (191226664723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95613332396 + 95613332397.

It is an arithmetic number, because the mean of its divisors is an integer number (95613332397).

Almost surely, 2^191226664793 is an apocalyptic number.

It is an amenable number.

191226664793 is a deficient number, since it is larger than the sum of its proper divisors (1).

191226664793 is an equidigital number, since it uses as much as digits as its factorization.

191226664793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The spelling of 191226664793 in words is "one hundred ninety-one billion, two hundred twenty-six million, six hundred sixty-four thousand, seven hundred ninety-three".