81013340808 has 64 divisors (see below), whose sum is σ = 225525484800. Its totient is φ = 26945835840.

The previous prime is 81013340753. The next prime is 81013340809. The reversal of 81013340808 is 80804331018.

It is a super-2 number, since 2×81013340808² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81013340809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307216 + ... + 506367.

It is an arithmetic number, because the mean of its divisors is an integer number (3523835700).

Almost surely, 2^81013340808 is an apocalyptic number.

It is an amenable number.

81013340808 is an abundant number, since it is smaller than the sum of its proper divisors (144512143992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81013340808 is a wasteful number, since it uses less digits than its factorization.

81013340808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814059 (or 814049 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

It can be divided in two parts, 81013 and 340808, that added together give a triangular number (421821 = T₉₁₈).

The spelling of 81013340808 in words is "eighty-one billion, thirteen million, three hundred forty thousand, eight hundred eight".