19783764017 has 2 divisors, whose sum is σ = 19783764018. Its totient is φ = 19783764016.

The previous prime is 19783763999. The next prime is 19783764073. The reversal of 19783764017 is 71046738791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10706247841 + 9077516176 = 103471^2 + 95276^2 .

It is a cyclic number.

It is not a de Polignac number, because 19783764017 - 2¹⁶ = 19783698481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19783764017.

It is not a weakly prime, because it can be changed into another prime (19783761017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9891882008 + 9891882009.

It is an arithmetic number, because the mean of its divisors is an integer number (9891882009).

Almost surely, 2^19783764017 is an apocalyptic number.

It is an amenable number.

19783764017 is a deficient number, since it is larger than the sum of its proper divisors (1).

19783764017 is an equidigital number, since it uses as much as digits as its factorization.

19783764017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The spelling of 19783764017 in words is "nineteen billion, seven hundred eighty-three million, seven hundred sixty-four thousand, seventeen".