81233361799 has 4 divisors (see below), whose sum is σ = 86011794864. Its totient is φ = 76454928736.

The previous prime is 81233361793. The next prime is 81233361841. The reversal of 81233361799 is 99716333218.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81233361799 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 (81233361793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2389216507 + ... + 2389216540.

It is an arithmetic number, because the mean of its divisors is an integer number (21502948716).

Almost surely, 2^81233361799 is an apocalyptic number.

81233361799 is a deficient number, since it is larger than the sum of its proper divisors (4778433065).

81233361799 is a wasteful number, since it uses less digits than its factorization.

81233361799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4778433064.

The product of its digits is 1469664, while the sum is 52.

The spelling of 81233361799 in words is "eighty-one billion, two hundred thirty-three million, three hundred sixty-one thousand, seven hundred ninety-nine".