19768365893 has 2 divisors, whose sum is σ = 19768365894. Its totient is φ = 19768365892.

The previous prime is 19768365857. The next prime is 19768365899. The reversal of 19768365893 is 39856386791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19426226884 + 342139009 = 139378^2 + 18497^2 .

It is a cyclic number.

It is not a de Polignac number, because 19768365893 - 2⁶ = 19768365829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19768365899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9884182946 + 9884182947.

It is an arithmetic number, because the mean of its divisors is an integer number (9884182947).

Almost surely, 2^19768365893 is an apocalyptic number.

It is an amenable number.

19768365893 is a deficient number, since it is larger than the sum of its proper divisors (1).

19768365893 is an equidigital number, since it uses as much as digits as its factorization.

19768365893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58786560, while the sum is 65.

The spelling of 19768365893 in words is "nineteen billion, seven hundred sixty-eight million, three hundred sixty-five thousand, eight hundred ninety-three".