20166644666099 has 2 divisors, whose sum is σ = 20166644666100. Its totient is φ = 20166644666098.

The previous prime is 20166644666071. The next prime is 20166644666117. The reversal of 20166644666099 is 99066644666102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20166644666099 is a prime.

It is a super-3 number, since 3×20166644666099³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20166644666039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083322333049 + 10083322333050.

It is an arithmetic number, because the mean of its divisors is an integer number (10083322333050).

Almost surely, 2^{20166644666099} is an apocalyptic number.

20166644666099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166644666099 is an equidigital number, since it uses as much as digits as its factorization.

20166644666099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120932352, while the sum is 65.

The spelling of 20166644666099 in words is "twenty trillion, one hundred sixty-six billion, six hundred forty-four million, six hundred sixty-six thousand, ninety-nine".