6638858859 has 4 divisors (see below), whose sum is σ = 8851811816. Its totient is φ = 4425905904.

The previous prime is 6638858813. The next prime is 6638858861. The reversal of 6638858859 is 9588588366.

6638858859 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6638858859 - 2⁷ = 6638858731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6638858859.

It is not an unprimeable number, because it can be changed into a prime (6638858869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106476474 + ... + 1106476479.

It is an arithmetic number, because the mean of its divisors is an integer number (2212952954).

Almost surely, 2^6638858859 is an apocalyptic number.

6638858859 is a deficient number, since it is larger than the sum of its proper divisors (2212952957).

6638858859 is a wasteful number, since it uses less digits than its factorization.

6638858859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212952956.

The product of its digits is 99532800, while the sum is 66.

The square root of 6638858859 is about 81479.1927979162. The cubic root of 6638858859 is about 1879.4515960231.

The spelling of 6638858859 in words is "six billion, six hundred thirty-eight million, eight hundred fifty-eight thousand, eight hundred fifty-nine".