166131799 has 4 divisors (see below), whose sum is σ = 166240600. Its totient is φ = 166023000.

The previous prime is 166131781. The next prime is 166131811. The reversal of 166131799 is 997131661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 997131661 = 239 ⋅4172099.

It is a cyclic number.

It is not a de Polignac number, because 166131799 - 2⁷ = 166131671 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 (166131709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52077 + ... + 55174.

It is an arithmetic number, because the mean of its divisors is an integer number (41560150).

Almost surely, 2^166131799 is an apocalyptic number.

166131799 is a deficient number, since it is larger than the sum of its proper divisors (108801).

166131799 is a wasteful number, since it uses less digits than its factorization.

166131799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108800.

The product of its digits is 61236, while the sum is 43.

The square root of 166131799 is about 12889.2125050369. The cubic root of 166131799 is about 549.7318792318.

The spelling of 166131799 in words is "one hundred sixty-six million, one hundred thirty-one thousand, seven hundred ninety-nine".