81533033518 has 16 divisors (see below), whose sum is σ = 125150054400. Its totient is φ = 39819798616.

The previous prime is 81533033513. The next prime is 81533033521.

81533033518 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81533033518² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81533033513) 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, 814918 + ... + 909481.

It is an arithmetic number, because the mean of its divisors is an integer number (7821878400).

Almost surely, 2^81533033518 is an apocalyptic number.

81533033518 is a deficient number, since it is larger than the sum of its proper divisors (43617020882).

81533033518 is a wasteful number, since it uses less digits than its factorization.

81533033518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724951.

The product of its (nonzero) digits is 129600, while the sum is 40.

It can be divided in two parts, 815330 and 33518, that added together give a palindrome (848848).

The spelling of 81533033518 in words is "eighty-one billion, five hundred thirty-three million, thirty-three thousand, five hundred eighteen".