6608117891 has 4 divisors (see below), whose sum is σ = 6748716192. Its totient is φ = 6467519592.

The previous prime is 6608117881. The next prime is 6608117903. The reversal of 6608117891 is 1987118066.

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 6608117891 - 2⁶ = 6608117827 is a prime.

It is a super-2 number, since 2×6608117891² = 87334444122708575762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 140598253 = 6608117891 / (6 + 6 + 0 + 8 + 1 + 1 + 7 + 8 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6608117881) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 70299080 + ... + 70299173.

It is an arithmetic number, because the mean of its divisors is an integer number (1687179048).

Almost surely, 2^6608117891 is an apocalyptic number.

6608117891 is a deficient number, since it is larger than the sum of its proper divisors (140598301).

6608117891 is a wasteful number, since it uses less digits than its factorization.

6608117891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140598300.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 6608117891 is about 81290.3308579809. The cubic root of 6608117891 is about 1876.5461987029.

The spelling of 6608117891 in words is "six billion, six hundred eight million, one hundred seventeen thousand, eight hundred ninety-one".