8643129685 has 8 divisors (see below), whose sum is σ = 10706328576. Its totient is φ = 6691455120.

The previous prime is 8643129673. The next prime is 8643129689. The reversal of 8643129685 is 5869213468.

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

It is not a de Polignac number, because 8643129685 - 2²⁹ = 8106258773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643129689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27880909 + ... + 27881218.

It is an arithmetic number, because the mean of its divisors is an integer number (1338291072).

Almost surely, 2^8643129685 is an apocalyptic number.

It is an amenable number.

8643129685 is a deficient number, since it is larger than the sum of its proper divisors (2063198891).

8643129685 is a wasteful number, since it uses less digits than its factorization.

8643129685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55762163.

The product of its digits is 2488320, while the sum is 52.

The square root of 8643129685 is about 92968.4338095463. The cubic root of 8643129685 is about 2052.2188693461.

The spelling of 8643129685 in words is "eight billion, six hundred forty-three million, one hundred twenty-nine thousand, six hundred eighty-five".