16545122330621 has 4 divisors (see below), whose sum is σ = 16563902266044. Its totient is φ = 16526342395200.

The previous prime is 16545122330609. The next prime is 16545122330623. The reversal of 16545122330621 is 12603322154561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6182607655225 + 10362514675396 = 2486485^2 + 3219086^2 .

It is a cyclic number.

It is not a de Polignac number, because 16545122330621 - 2¹⁰ = 16545122329597 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 (16545122330623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9389966390 + ... + 9389968151.

It is an arithmetic number, because the mean of its divisors is an integer number (4140975566511).

Almost surely, 2^{16545122330621} is an apocalyptic number.

It is an amenable number.

16545122330621 is a deficient number, since it is larger than the sum of its proper divisors (18779935423).

16545122330621 is an equidigital number, since it uses as much as digits as its factorization.

16545122330621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18779935422.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 16545122330621 in words is "sixteen trillion, five hundred forty-five billion, one hundred twenty-two million, three hundred thirty thousand, six hundred twenty-one".