19944365783 has 2 divisors, whose sum is σ = 19944365784. Its totient is φ = 19944365782.

The previous prime is 19944365719. The next prime is 19944365821. The reversal of 19944365783 is 38756344991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19944365783 - 2⁶ = 19944365719 is a prime.

It is a super-2 number, since 2×19944365783² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19944365713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972182891 + 9972182892.

It is an arithmetic number, because the mean of its divisors is an integer number (9972182892).

Almost surely, 2^19944365783 is an apocalyptic number.

19944365783 is a deficient number, since it is larger than the sum of its proper divisors (1).

19944365783 is an equidigital number, since it uses as much as digits as its factorization.

19944365783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 59.

The spelling of 19944365783 in words is "nineteen billion, nine hundred forty-four million, three hundred sixty-five thousand, seven hundred eighty-three".