19794895663 has 2 divisors, whose sum is σ = 19794895664. Its totient is φ = 19794895662.

The previous prime is 19794895649. The next prime is 19794895691. The reversal of 19794895663 is 36659849791.

It is a weak prime.

It is an emirp because it is prime and its reverse (36659849791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19794895663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19794895643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9897447831 + 9897447832.

It is an arithmetic number, because the mean of its divisors is an integer number (9897447832).

Almost surely, 2^19794895663 is an apocalyptic number.

19794895663 is a deficient number, since it is larger than the sum of its proper divisors (1).

19794895663 is an equidigital number, since it uses as much as digits as its factorization.

19794895663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 67.

The spelling of 19794895663 in words is "nineteen billion, seven hundred ninety-four million, eight hundred ninety-five thousand, six hundred sixty-three".