16531021812533 has 16 divisors (see below), whose sum is σ = 17507673268800. Its totient is φ = 15565269692160.

The previous prime is 16531021812523. The next prime is 16531021812553. The reversal of 16531021812533 is 33521812013561.

It is not a de Polignac number, because 16531021812533 - 2³⁶ = 16462302335797 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 (16531021812523) 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, 842516 + ... + 5811357.

It is an arithmetic number, because the mean of its divisors is an integer number (1094229579300).

Almost surely, 2^{16531021812533} is an apocalyptic number.

It is an amenable number.

16531021812533 is a deficient number, since it is larger than the sum of its proper divisors (976651456267).

16531021812533 is a wasteful number, since it uses less digits than its factorization.

16531021812533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654692.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 16531021812533 in words is "sixteen trillion, five hundred thirty-one billion, twenty-one million, eight hundred twelve thousand, five hundred thirty-three".