8643129666 has 16 divisors (see below), whose sum is σ = 17882337600. Its totient is φ = 2781696848.

The previous prime is 8643129631. The next prime is 8643129673. The reversal of 8643129666 is 6669213468.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24836406 + ... + 24836753.

It is an arithmetic number, because the mean of its divisors is an integer number (1117646100).

Almost surely, 2^8643129666 is an apocalyptic number.

8643129666 is an abundant number, since it is smaller than the sum of its proper divisors (9239207934).

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

8643129666 is a wasteful number, since it uses less digits than its factorization.

8643129666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49673193.

The product of its digits is 2239488, while the sum is 51.

The square root of 8643129666 is about 92968.4337073611. The cubic root of 8643129666 is about 2052.2188678424.

The spelling of 8643129666 in words is "eight billion, six hundred forty-three million, one hundred twenty-nine thousand, six hundred sixty-six".