6640018858 has 16 divisors (see below), whose sum is σ = 10896631200. Its totient is φ = 3009538800.

The previous prime is 6640018829. The next prime is 6640018897. The reversal of 6640018858 is 8588100466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424728 + ... + 440083.

It is an arithmetic number, because the mean of its divisors is an integer number (681039450).

Almost surely, 2^6640018858 is an apocalyptic number.

6640018858 is a deficient number, since it is larger than the sum of its proper divisors (4256612342).

6640018858 is a wasteful number, since it uses less digits than its factorization.

6640018858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865173.

The product of its (nonzero) digits is 368640, while the sum is 46.

The square root of 6640018858 is about 81486.3108626228. The cubic root of 6640018858 is about 1879.5610543428.

It can be divided in two parts, 66400 and 18858, that added together give a palindrome (85258).

The spelling of 6640018858 in words is "six billion, six hundred forty million, eighteen thousand, eight hundred fifty-eight".