1666129098199 has 2 divisors, whose sum is σ = 1666129098200. Its totient is φ = 1666129098198.

The previous prime is 1666129098103. The next prime is 1666129098217. The reversal of 1666129098199 is 9918909216661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9918909216661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1666129098199 - 2⁷ = 1666129098071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666129098299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833064549099 + 833064549100.

It is an arithmetic number, because the mean of its divisors is an integer number (833064549100).

Almost surely, 2^{1666129098199} is an apocalyptic number.

1666129098199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666129098199 is an equidigital number, since it uses as much as digits as its factorization.

1666129098199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The spelling of 1666129098199 in words is "one trillion, six hundred sixty-six billion, one hundred twenty-nine million, ninety-eight thousand, one hundred ninety-nine".