16661171663 has 2 divisors, whose sum is σ = 16661171664. Its totient is φ = 16661171662.

The previous prime is 16661171647. The next prime is 16661171677. The reversal of 16661171663 is 36617116661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16661171663 - 2⁴ = 16661171647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16661171603) 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, 8330585831 + 8330585832.

It is an arithmetic number, because the mean of its divisors is an integer number (8330585832).

Almost surely, 2^16661171663 is an apocalyptic number.

16661171663 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661171663 is an equidigital number, since it uses as much as digits as its factorization.

16661171663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The spelling of 16661171663 in words is "sixteen billion, six hundred sixty-one million, one hundred seventy-one thousand, six hundred sixty-three".