16661172206411 has 2 divisors, whose sum is σ = 16661172206412. Its totient is φ = 16661172206410.

The previous prime is 16661172206407. The next prime is 16661172206453. The reversal of 16661172206411 is 11460227116661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16661172206411 - 2² = 16661172206407 is a prime.

It is not a weakly prime, because it can be changed into another prime (16661172200411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330586103205 + 8330586103206.

It is an arithmetic number, because the mean of its divisors is an integer number (8330586103206).

Almost surely, 2^{16661172206411} is an apocalyptic number.

16661172206411 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661172206411 is an equidigital number, since it uses as much as digits as its factorization.

16661172206411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 16661172206411 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, two hundred six thousand, four hundred eleven".