19926237791 has 2 divisors, whose sum is σ = 19926237792. Its totient is φ = 19926237790.

The previous prime is 19926237781. The next prime is 19926237823. The reversal of 19926237791 is 19773262991.

It is a weak prime.

It is an emirp because it is prime and its reverse (19773262991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19926237791 - 2¹⁰ = 19926236767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19926237701) 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, 9963118895 + 9963118896.

It is an arithmetic number, because the mean of its divisors is an integer number (9963118896).

Almost surely, 2^19926237791 is an apocalyptic number.

19926237791 is a deficient number, since it is larger than the sum of its proper divisors (1).

19926237791 is an equidigital number, since it uses as much as digits as its factorization.

19926237791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 56.

The spelling of 19926237791 in words is "nineteen billion, nine hundred twenty-six million, two hundred thirty-seven thousand, seven hundred ninety-one".