81000011000019 has 16 divisors (see below), whose sum is σ = 110921010628352. Its totient is φ = 52539564001248.

The previous prime is 81000010999993. The next prime is 81000011000033. The reversal of 81000011000019 is 91000011000018.

It is not a de Polignac number, because 81000011000019 - 2⁹ = 81000010999507 is a prime.

It is a super-2 number, since 2×81000011000019² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81000010999959 and 81000011000004.

It is not an unprimeable number, because it can be changed into a prime (81000011000099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852109 + ... + 12756414.

It is an arithmetic number, because the mean of its divisors is an integer number (6932563164272).

Almost surely, 2^{81000011000019} is an apocalyptic number.

81000011000019 is a deficient number, since it is larger than the sum of its proper divisors (29920999628333).

81000011000019 is a wasteful number, since it uses less digits than its factorization.

81000011000019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13662186.

The product of its (nonzero) digits is 72, while the sum is 21.

Subtracting 81000011000019 from its reverse (91000011000018), we obtain a palindrome (9999999999999).

The spelling of 81000011000019 in words is "eighty-one trillion, eleven million, nineteen", and thus it is an aban number and an uban number.