1666129098207 has 128 divisors (see below), whose sum is σ = 2657876115456. Its totient is φ = 908812800000.

The previous prime is 1666129098199. The next prime is 1666129098217. The reversal of 1666129098207 is 7028909216661.

It is not a de Polignac number, because 1666129098207 - 2³ = 1666129098199 is a prime.

It is a super-2 number, since 2×1666129098207² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666129098217) 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 in 127 ways as a sum of consecutive naturals, for example, 4154935207 + ... + 4154935607.

It is an arithmetic number, because the mean of its divisors is an integer number (20764657152).

Almost surely, 2^{1666129098207} is an apocalyptic number.

1666129098207 is a deficient number, since it is larger than the sum of its proper divisors (991747017249).

1666129098207 is a wasteful number, since it uses less digits than its factorization.

1666129098207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 1666129098207 in words is "one trillion, six hundred sixty-six billion, one hundred twenty-nine million, ninety-eight thousand, two hundred seven".