81040908450 has 96 divisors (see below), whose sum is σ = 202533322752. Its totient is φ = 21444616000.

The previous prime is 81040908433. The next prime is 81040908493. The reversal of 81040908450 is 5480904018.

It is a junction number, because it is equal to n+sod(n) for n = 81040908399 and 81040908408.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12344869 + ... + 12351431.

It is an arithmetic number, because the mean of its divisors is an integer number (2109722112).

Almost surely, 2^81040908450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81040908450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101266661376).

81040908450 is an abundant number, since it is smaller than the sum of its proper divisors (121492414302).

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

81040908450 is a wasteful number, since it uses less digits than its factorization.

81040908450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7200 (or 7195 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 81040908450 in words is "eighty-one billion, forty million, nine hundred eight thousand, four hundred fifty".