19968849863 has 2 divisors, whose sum is σ = 19968849864. Its totient is φ = 19968849862.

The previous prime is 19968849853. The next prime is 19968849869. The reversal of 19968849863 is 36894886991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19968849863 - 2²² = 19964655559 is a prime.

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 (19968849869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984424931 + 9984424932.

It is an arithmetic number, because the mean of its divisors is an integer number (9984424932).

Almost surely, 2^19968849863 is an apocalyptic number.

19968849863 is a deficient number, since it is larger than the sum of its proper divisors (1).

19968849863 is an equidigital number, since it uses as much as digits as its factorization.

19968849863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161243136, while the sum is 71.

The spelling of 19968849863 in words is "nineteen billion, nine hundred sixty-eight million, eight hundred forty-nine thousand, eight hundred sixty-three".