81799456743 has 16 divisors (see below), whose sum is σ = 125093555200. Its totient is φ = 52773842520.

The previous prime is 81799456729. The next prime is 81799456747. The reversal of 81799456743 is 34765499718.

81799456743 is a `hidden beast` number, since 8 + 179 + 9 + 456 + 7 + 4 + 3 = 666.

It is not a de Polignac number, because 81799456743 - 2⁴ = 81799456727 is a prime.

It is a super-2 number, since 2×81799456743² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81799456747) 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 15 ways as a sum of consecutive naturals, for example, 48863833 + ... + 48865506.

It is an arithmetic number, because the mean of its divisors is an integer number (7818347200).

Almost surely, 2^81799456743 is an apocalyptic number.

81799456743 is a deficient number, since it is larger than the sum of its proper divisors (43294098457).

81799456743 is a wasteful number, since it uses less digits than its factorization.

81799456743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97729379 (or 97729373 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 81799456743 in words is "eighty-one billion, seven hundred ninety-nine million, four hundred fifty-six thousand, seven hundred forty-three".