6856988091 has 8 divisors (see below), whose sum is σ = 9540157440. Its totient is φ = 4372572072.

The previous prime is 6856988081. The next prime is 6856988167. The reversal of 6856988091 is 1908896586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6856988091 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6856988081) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 49688251 + ... + 49688388.

It is an arithmetic number, because the mean of its divisors is an integer number (1192519680).

Almost surely, 2^6856988091 is an apocalyptic number.

6856988091 is a deficient number, since it is larger than the sum of its proper divisors (2683169349).

6856988091 is a wasteful number, since it uses less digits than its factorization.

6856988091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99376665.

The product of its (nonzero) digits is 7464960, while the sum is 60.

The square root of 6856988091 is about 82806.9326264414. The cubic root of 6856988091 is about 1899.8142099958.

The spelling of 6856988091 in words is "six billion, eight hundred fifty-six million, nine hundred eighty-eight thousand, ninety-one".