6691138163 has 4 divisors (see below), whose sum is σ = 6697705560. Its totient is φ = 6684570768.

The previous prime is 6691138151. The next prime is 6691138169. The reversal of 6691138163 is 3618311966.

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

It is a cyclic number.

It is not a de Polignac number, because 6691138163 - 2⁴ = 6691138147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691138169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3282170 + ... + 3284207.

It is an arithmetic number, because the mean of its divisors is an integer number (1674426390).

Almost surely, 2^6691138163 is an apocalyptic number.

6691138163 is a deficient number, since it is larger than the sum of its proper divisors (6567397).

6691138163 is a wasteful number, since it uses less digits than its factorization.

6691138163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6567396.

The product of its digits is 139968, while the sum is 44.

The square root of 6691138163 is about 81799.3775220814. The cubic root of 6691138163 is about 1884.3721017506.

The spelling of 6691138163 in words is "six billion, six hundred ninety-one million, one hundred thirty-eight thousand, one hundred sixty-three".