81533286533 has 8 divisors (see below), whose sum is σ = 85834298400. Its totient is φ = 77233253328.

The previous prime is 81533286521. The next prime is 81533286539. The reversal of 81533286533 is 33568233518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81533286533 - 2⁸ = 81533286277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81533286539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70463 + ... + 409916.

It is an arithmetic number, because the mean of its divisors is an integer number (10729287300).

Almost surely, 2^81533286533 is an apocalyptic number.

It is an amenable number.

81533286533 is a deficient number, since it is larger than the sum of its proper divisors (4301011867).

81533286533 is a wasteful number, since it uses less digits than its factorization.

81533286533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489331.

The product of its digits is 1555200, while the sum is 47.

The spelling of 81533286533 in words is "eighty-one billion, five hundred thirty-three million, two hundred eighty-six thousand, five hundred thirty-three".