81403533530418 has 96 divisors (see below), whose sum is σ = 180987126243840. Its totient is φ = 24387445843200.

The previous prime is 81403533530413. The next prime is 81403533530441.

81403533530418 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81403533530418² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81403533530413) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 531115071 + ... + 531268317.

It is an arithmetic number, because the mean of its divisors is an integer number (1885282565040).

Almost surely, 2^{81403533530418} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81403533530418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90493563121920).

81403533530418 is an abundant number, since it is smaller than the sum of its proper divisors (99583592713422).

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

81403533530418 is a wasteful number, since it uses less digits than its factorization.

81403533530418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161584 (or 161573 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 81403533530418 in words is "eighty-one trillion, four hundred three billion, five hundred thirty-three million, five hundred thirty thousand, four hundred eighteen".