16654521112321 has 2 divisors, whose sum is σ = 16654521112322. Its totient is φ = 16654521112320.

The previous prime is 16654521112297. The next prime is 16654521112349. The reversal of 16654521112321 is 12321112545661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14637663846400 + 2016857265921 = 3825920^2 + 1420161^2 .

It is a cyclic number.

It is not a de Polignac number, because 16654521112321 - 2⁵ = 16654521112289 is a prime.

It is not a weakly prime, because it can be changed into another prime (16654521112121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8327260556160 + 8327260556161.

It is an arithmetic number, because the mean of its divisors is an integer number (8327260556161).

Almost surely, 2^{16654521112321} is an apocalyptic number.

It is an amenable number.

16654521112321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16654521112321 is an equidigital number, since it uses as much as digits as its factorization.

16654521112321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

Adding to 16654521112321 its reverse (12321112545661), we get a palindrome (28975633657982).

The spelling of 16654521112321 in words is "sixteen trillion, six hundred fifty-four billion, five hundred twenty-one million, one hundred twelve thousand, three hundred twenty-one".