20166661461743 has 2 divisors, whose sum is σ = 20166661461744. Its totient is φ = 20166661461742.

The previous prime is 20166661461719. The next prime is 20166661461809. The reversal of 20166661461743 is 34716416666102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20166661461743 - 2¹⁶ = 20166661396207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20166661461943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083330730871 + 10083330730872.

It is an arithmetic number, because the mean of its divisors is an integer number (10083330730872).

Almost surely, 2^{20166661461743} is an apocalyptic number.

20166661461743 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166661461743 is an equidigital number, since it uses as much as digits as its factorization.

20166661461743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 20166661461743 in words is "twenty trillion, one hundred sixty-six billion, six hundred sixty-one million, four hundred sixty-one thousand, seven hundred forty-three".