6661116101173 has 2 divisors, whose sum is σ = 6661116101174. Its totient is φ = 6661116101172.

The previous prime is 6661116101117. The next prime is 6661116101179. The reversal of 6661116101173 is 3711016111666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4390965184369 + 2270150916804 = 2095463^2 + 1506702^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6661116101173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6661116101179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330558050586 + 3330558050587.

It is an arithmetic number, because the mean of its divisors is an integer number (3330558050587).

Almost surely, 2^{6661116101173} is an apocalyptic number.

It is an amenable number.

6661116101173 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661116101173 is an equidigital number, since it uses as much as digits as its factorization.

6661116101173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The spelling of 6661116101173 in words is "six trillion, six hundred sixty-one billion, one hundred sixteen million, one hundred one thousand, one hundred seventy-three".