6693806638 has 4 divisors (see below), whose sum is σ = 10040709960. Its totient is φ = 3346903318.

The previous prime is 6693806629. The next prime is 6693806663. The reversal of 6693806638 is 8366083966.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1673451658 + ... + 1673451661.

It is an arithmetic number, because the mean of its divisors is an integer number (2510177490).

Almost surely, 2^6693806638 is an apocalyptic number.

6693806638 is a deficient number, since it is larger than the sum of its proper divisors (3346903322).

6693806638 is a wasteful number, since it uses less digits than its factorization.

6693806638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346903321.

The product of its (nonzero) digits is 6718464, while the sum is 55.

The square root of 6693806638 is about 81815.6869921655. The cubic root of 6693806638 is about 1884.6225689315.

The spelling of 6693806638 in words is "six billion, six hundred ninety-three million, eight hundred six thousand, six hundred thirty-eight".