19968848981 has 2 divisors, whose sum is σ = 19968848982. Its totient is φ = 19968848980.

The previous prime is 19968848959. The next prime is 19968849079. The reversal of 19968848981 is 18984886991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17919838225 + 2049010756 = 133865^2 + 45266^2 .

It is a cyclic number.

It is not a de Polignac number, because 19968848981 - 2¹⁸ = 19968586837 is a prime.

It is a super-2 number, since 2×19968848981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19968878981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984424490 + 9984424491.

It is an arithmetic number, because the mean of its divisors is an integer number (9984424491).

Almost surely, 2^19968848981 is an apocalyptic number.

It is an amenable number.

19968848981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19968848981 is an equidigital number, since it uses as much as digits as its factorization.

19968848981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71663616, while the sum is 71.

The spelling of 19968848981 in words is "nineteen billion, nine hundred sixty-eight million, eight hundred forty-eight thousand, nine hundred eighty-one".