19964922917 has 2 divisors, whose sum is σ = 19964922918. Its totient is φ = 19964922916.

The previous prime is 19964922889. The next prime is 19964922949. The reversal of 19964922917 is 71922946991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18700836001 + 1264086916 = 136751^2 + 35554^2 .

It is a cyclic number.

It is not a de Polignac number, because 19964922917 - 2¹⁸ = 19964660773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19964922997) 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, 9982461458 + 9982461459.

It is an arithmetic number, because the mean of its divisors is an integer number (9982461459).

Almost surely, 2^19964922917 is an apocalyptic number.

It is an amenable number.

19964922917 is a deficient number, since it is larger than the sum of its proper divisors (1).

19964922917 is an equidigital number, since it uses as much as digits as its factorization.

19964922917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The spelling of 19964922917 in words is "nineteen billion, nine hundred sixty-four million, nine hundred twenty-two thousand, nine hundred seventeen".