1666129098091 has 2 divisors, whose sum is σ = 1666129098092. Its totient is φ = 1666129098090.

The previous prime is 1666129098079. The next prime is 1666129098103. The reversal of 1666129098091 is 1908909216661.

It is a balanced prime because it is at equal distance from previous prime (1666129098079) and next prime (1666129098103).

It is a cyclic number.

It is not a de Polignac number, because 1666129098091 - 2¹⁹ = 1666128573803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666129098071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833064549045 + 833064549046.

It is an arithmetic number, because the mean of its divisors is an integer number (833064549046).

Almost surely, 2^{1666129098091} is an apocalyptic number.

1666129098091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666129098091 is an equidigital number, since it uses as much as digits as its factorization.

1666129098091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 58.

The spelling of 1666129098091 in words is "one trillion, six hundred sixty-six billion, one hundred twenty-nine million, ninety-eight thousand, ninety-one".