81944833019 has 12 divisors (see below), whose sum is σ = 95447583000. Its totient is φ = 70147058688.

The previous prime is 81944833001. The next prime is 81944833039. The reversal of 81944833019 is 91033844918.

It is not a de Polignac number, because 81944833019 - 2⁸ = 81944832763 is a prime.

It is a super-2 number, since 2×81944833019² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81944833039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1049669 + ... + 1125030.

It is an arithmetic number, because the mean of its divisors is an integer number (7953965250).

Almost surely, 2^81944833019 is an apocalyptic number.

81944833019 is a deficient number, since it is larger than the sum of its proper divisors (13502749981).

81944833019 is a wasteful number, since it uses less digits than its factorization.

81944833019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175482 (or 2175475 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 81944833019 in words is "eighty-one billion, nine hundred forty-four million, eight hundred thirty-three thousand, nineteen".