20161666433291 has 2 divisors, whose sum is σ = 20161666433292. Its totient is φ = 20161666433290.

The previous prime is 20161666433257. The next prime is 20161666433299. The reversal of 20161666433291 is 19233466616102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20161666433291 - 2¹⁰ = 20161666432267 is a prime.

It is not a weakly prime, because it can be changed into another prime (20161666433299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080833216645 + 10080833216646.

It is an arithmetic number, because the mean of its divisors is an integer number (10080833216646).

Almost surely, 2^{20161666433291} is an apocalyptic number.

20161666433291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161666433291 is an equidigital number, since it uses as much as digits as its factorization.

20161666433291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 20161666433291 in words is "twenty trillion, one hundred sixty-one billion, six hundred sixty-six million, four hundred thirty-three thousand, two hundred ninety-one".