20161666433213 has 2 divisors, whose sum is σ = 20161666433214. Its totient is φ = 20161666433212.

The previous prime is 20161666433197. The next prime is 20161666433221. The reversal of 20161666433213 is 31233466616102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11188208834884 + 8973457598329 = 3344878^2 + 2995573^2 .

It is a cyclic number.

It is not a de Polignac number, because 20161666433213 - 2⁴ = 20161666433197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20161666433243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080833216606 + 10080833216607.

It is an arithmetic number, because the mean of its divisors is an integer number (10080833216607).

Almost surely, 2^{20161666433213} is an apocalyptic number.

It is an amenable number.

20161666433213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161666433213 is an equidigital number, since it uses as much as digits as its factorization.

20161666433213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 20161666433213 in words is "twenty trillion, one hundred sixty-one billion, six hundred sixty-six million, four hundred thirty-three thousand, two hundred thirteen".