16661061643133 has 4 divisors (see below), whose sum is σ = 16701797735580. Its totient is φ = 16620325550688.

The previous prime is 16661061643103. The next prime is 16661061643151. The reversal of 16661061643133 is 33134616016661.

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 15660207460804 + 1000854182329 = 3957298^2 + 1000427^2 .

It is a cyclic number.

It is not a de Polignac number, because 16661061643133 - 2⁶ = 16661061643069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661061643103) 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, 20368045610 + ... + 20368046427.

It is an arithmetic number, because the mean of its divisors is an integer number (4175449433895).

Almost surely, 2^{16661061643133} is an apocalyptic number.

It is an amenable number.

16661061643133 is a deficient number, since it is larger than the sum of its proper divisors (40736092447).

16661061643133 is an equidigital number, since it uses as much as digits as its factorization.

16661061643133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40736092446.

The product of its (nonzero) digits is 839808, while the sum is 47.

Adding to 16661061643133 its reverse (33134616016661), we get a palindrome (49795677659794).

The spelling of 16661061643133 in words is "sixteen trillion, six hundred sixty-one billion, sixty-one million, six hundred forty-three thousand, one hundred thirty-three".