81733016199 has 4 divisors (see below), whose sum is σ = 108977354936. Its totient is φ = 54488677464.

The previous prime is 81733016119. The next prime is 81733016213. The reversal of 81733016199 is 99161033718.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81733016199 - 2¹¹ = 81733014151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81733016119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13622169364 + ... + 13622169369.

It is an arithmetic number, because the mean of its divisors is an integer number (27244338734).

Almost surely, 2^81733016199 is an apocalyptic number.

81733016199 is a deficient number, since it is larger than the sum of its proper divisors (27244338737).

81733016199 is a wasteful number, since it uses less digits than its factorization.

81733016199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27244338736.

The product of its (nonzero) digits is 244944, while the sum is 48.

The spelling of 81733016199 in words is "eighty-one billion, seven hundred thirty-three million, sixteen thousand, one hundred ninety-nine".