6689643386 has 32 divisors (see below), whose sum is σ = 11038325760. Its totient is φ = 3029198256.

The previous prime is 6689643383. The next prime is 6689643397. The reversal of 6689643386 is 6833469866.

It is not an unprimeable number, because it can be changed into a prime (6689643383) 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, 33245 + ... + 120351.

It is an arithmetic number, because the mean of its divisors is an integer number (344947680).

Almost surely, 2^6689643386 is an apocalyptic number.

6689643386 is a deficient number, since it is larger than the sum of its proper divisors (4348682374).

6689643386 is a wasteful number, since it uses less digits than its factorization.

6689643386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87218.

The product of its digits is 26873856, while the sum is 59.

The square root of 6689643386 is about 81790.2401634816. The cubic root of 6689643386 is about 1884.2317705751.

The spelling of 6689643386 in words is "six billion, six hundred eighty-nine million, six hundred forty-three thousand, three hundred eighty-six".