81043814040 has 64 divisors (see below), whose sum is σ = 277864508160. Its totient is φ = 18524300160.

The previous prime is 81043814029. The next prime is 81043814041. The reversal of 81043814040 is 4041834018.

It is a super-2 number, since 2×81043814040² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81043813992 and 81043814010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81043814041) 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, 48239526 + ... + 48241205.

It is an arithmetic number, because the mean of its divisors is an integer number (4341632940).

Almost surely, 2^81043814040 is an apocalyptic number.

It is an amenable number.

81043814040 is an abundant number, since it is smaller than the sum of its proper divisors (196820694120).

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

81043814040 is a wasteful number, since it uses less digits than its factorization.

81043814040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96480752 (or 96480748 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The spelling of 81043814040 in words is "eighty-one billion, forty-three million, eight hundred fourteen thousand, forty".