19996081081 has 2 divisors, whose sum is σ = 19996081082. Its totient is φ = 19996081080.

The previous prime is 19996081033. The next prime is 19996081093. The reversal of 19996081081 is 18018069991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19913725456 + 82355625 = 141116^2 + 9075^2 .

It is a cyclic number.

It is not a de Polignac number, because 19996081081 - 2¹⁵ = 19996048313 is a prime.

It is a super-2 number, since 2×19996081081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19996082081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998040540 + 9998040541.

It is an arithmetic number, because the mean of its divisors is an integer number (9998040541).

Almost surely, 2^19996081081 is an apocalyptic number.

It is an amenable number.

19996081081 is a deficient number, since it is larger than the sum of its proper divisors (1).

19996081081 is an equidigital number, since it uses as much as digits as its factorization.

19996081081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 52.

The spelling of 19996081081 in words is "nineteen billion, nine hundred ninety-six million, eighty-one thousand, eighty-one".