81112492033 has 2 divisors, whose sum is σ = 81112492034. Its totient is φ = 81112492032.

The previous prime is 81112491959. The next prime is 81112492039. The reversal of 81112492033 is 33029421118.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57219988849 + 23892503184 = 239207^2 + 154572^2 .

It is a cyclic number.

It is not a de Polignac number, because 81112492033 - 2²⁵ = 81078937601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81112492033.

It is not a weakly prime, because it can be changed into another prime (81112492039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40556246016 + 40556246017.

It is an arithmetic number, because the mean of its divisors is an integer number (40556246017).

Almost surely, 2^81112492033 is an apocalyptic number.

It is an amenable number.

81112492033 is a deficient number, since it is larger than the sum of its proper divisors (1).

81112492033 is an equidigital number, since it uses as much as digits as its factorization.

81112492033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 81112492033 in words is "eighty-one billion, one hundred twelve million, four hundred ninety-two thousand, thirty-three".