16521666133 has 16 divisors (see below), whose sum is σ = 19155757824. Its totient is φ = 13956203520.

The previous prime is 16521666047. The next prime is 16521666157. The reversal of 16521666133 is 33166612561.

It is a de Polignac number, because none of the positive numbers 2^k-16521666133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521666173) 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, 1553791 + ... + 1564387.

It is an arithmetic number, because the mean of its divisors is an integer number (1197234864).

Almost surely, 2^16521666133 is an apocalyptic number.

It is an amenable number.

16521666133 is a deficient number, since it is larger than the sum of its proper divisors (2634091691).

16521666133 is a wasteful number, since it uses less digits than its factorization.

16521666133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13812.

The product of its digits is 116640, while the sum is 40.

The spelling of 16521666133 in words is "sixteen billion, five hundred twenty-one million, six hundred sixty-six thousand, one hundred thirty-three".