166143566 has 8 divisors (see below), whose sum is σ = 249389184. Its totient is φ = 83013840.

The previous prime is 166143563. The next prime is 166143583. The reversal of 166143566 is 665341661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166143563) 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, 25295 + ... + 31178.

It is an arithmetic number, because the mean of its divisors is an integer number (31173648).

Almost surely, 2^166143566 is an apocalyptic number.

166143566 is a deficient number, since it is larger than the sum of its proper divisors (83245618).

166143566 is a wasteful number, since it uses less digits than its factorization.

166143566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57946.

The product of its digits is 77760, while the sum is 38.

The square root of 166143566 is about 12889.6689639416. The cubic root of 166143566 is about 549.7448579678.

The spelling of 166143566 in words is "one hundred sixty-six million, one hundred forty-three thousand, five hundred sixty-six".