82143666 has 32 divisors (see below), whose sum is σ = 199137600. Its totient is φ = 24891840.

The previous prime is 82143661. The next prime is 82143671. The reversal of 82143666 is 66634128.

It is an interprime number because it is at equal distance from previous prime (82143661) and next prime (82143671).

It is a super-3 number, since 3×82143666³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82143666.

It is not an unprimeable number, because it can be changed into a prime (82143661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68551 + ... + 69738.

It is an arithmetic number, because the mean of its divisors is an integer number (6223050).

Almost surely, 2^82143666 is an apocalyptic number.

82143666 is an abundant number, since it is smaller than the sum of its proper divisors (116993934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82143666 is a wasteful number, since it uses less digits than its factorization.

82143666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138311 (or 138305 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 82143666 is about 9063.3142944510. The cubic root of 82143666 is about 434.7017217965.

The spelling of 82143666 in words is "eighty-two million, one hundred forty-three thousand, six hundred sixty-six".