81336808443 has 8 divisors (see below), whose sum is σ = 118308085056. Its totient is φ = 49295035400.

The previous prime is 81336808433. The next prime is 81336808447. The reversal of 81336808443 is 34480863318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81336808443 - 2⁹ = 81336807931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81336808392 and 81336808401.

It is not an unprimeable number, because it can be changed into a prime (81336808447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232375853 + ... + 1232375918.

It is an arithmetic number, because the mean of its divisors is an integer number (14788510632).

Almost surely, 2^81336808443 is an apocalyptic number.

81336808443 is a deficient number, since it is larger than the sum of its proper divisors (36971276613).

81336808443 is a wasteful number, since it uses less digits than its factorization.

81336808443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464751785.

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 81336808443 in words is "eighty-one billion, three hundred thirty-six million, eight hundred eight thousand, four hundred forty-three".