16650081534321 has 12 divisors (see below), whose sum is σ = 24093295728372. Its totient is φ = 11080126068576.

The previous prime is 16650081534311. The next prime is 16650081534353. The reversal of 16650081534321 is 12343518005661.

16650081534321 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 0 + 0 + 81 + 534 + 32 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8248895223921 + 8401186310400 = 2872089^2 + 2898480^2 .

It is not a de Polignac number, because 16650081534321 - 2⁹ = 16650081533809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16650081534301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1660685346 + ... + 1660695371.

It is an arithmetic number, because the mean of its divisors is an integer number (2007774644031).

Almost surely, 2^{16650081534321} is an apocalyptic number.

It is an amenable number.

16650081534321 is a deficient number, since it is larger than the sum of its proper divisors (7443214194051).

16650081534321 is a wasteful number, since it uses less digits than its factorization.

16650081534321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321381280 (or 3321381277 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

Adding to 16650081534321 its reverse (12343518005661), we get a palindrome (28993599539982).

The spelling of 16650081534321 in words is "sixteen trillion, six hundred fifty billion, eighty-one million, five hundred thirty-four thousand, three hundred twenty-one".