143666217 has 24 divisors (see below), whose sum is σ = 215764640. Its totient is φ = 95659380.

The previous prime is 143666213. The next prime is 143666219. The reversal of 143666217 is 712666341.

It is a happy number.

It is not a de Polignac number, because 143666217 - 2² = 143666213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143666213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176742 + ... + 177552.

Almost surely, 2^143666217 is an apocalyptic number.

It is an amenable number.

143666217 is a deficient number, since it is larger than the sum of its proper divisors (72098423).

143666217 is an frugal number, since it uses more digits than its factorization.

143666217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 814 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 143666217 is about 11986.0843063946. The cubic root of 143666217 is about 523.7429845476.

The spelling of 143666217 in words is "one hundred forty-three million, six hundred sixty-six thousand, two hundred seventeen".