166053955199 has 4 divisors (see below), whose sum is σ = 181149769320. Its totient is φ = 150958141080.

The previous prime is 166053955159. The next prime is 166053955213. The reversal of 166053955199 is 991559350661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991559350661 = 11 ⋅90141759151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166053955199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166053955139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7547907044 + ... + 7547907065.

It is an arithmetic number, because the mean of its divisors is an integer number (45287442330).

Almost surely, 2^166053955199 is an apocalyptic number.

166053955199 is a deficient number, since it is larger than the sum of its proper divisors (15095814121).

166053955199 is a wasteful number, since it uses less digits than its factorization.

166053955199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15095814120.

The product of its (nonzero) digits is 9841500, while the sum is 59.

The spelling of 166053955199 in words is "one hundred sixty-six billion, fifty-three million, nine hundred fifty-five thousand, one hundred ninety-nine".