166671899 has 4 divisors (see below), whose sum is σ = 168390264. Its totient is φ = 164953536.

The previous prime is 166671889. The next prime is 166671907. The reversal of 166671899 is 998176661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998176661 = 16103 ⋅61987.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166671899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166671899.

It is not an unprimeable number, because it can be changed into a prime (166671809) 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, 859037 + ... + 859230.

It is an arithmetic number, because the mean of its divisors is an integer number (42097566).

Almost surely, 2^166671899 is an apocalyptic number.

166671899 is a deficient number, since it is larger than the sum of its proper divisors (1718365).

166671899 is an equidigital number, since it uses as much as digits as its factorization.

166671899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718364.

The product of its digits is 979776, while the sum is 53.

The square root of 166671899 is about 12910.1471331662. The cubic root of 166671899 is about 550.3269670168.

The spelling of 166671899 in words is "one hundred sixty-six million, six hundred seventy-one thousand, eight hundred ninety-nine".