6171646986 has 128 divisors (see below), whose sum is σ = 14910428160. Its totient is φ = 1884819456.

The previous prime is 6171646967. The next prime is 6171646993. The reversal of 6171646986 is 6896461716.

It is a happy number.

6171646986 is a `hidden beast` number, since 6 + 171 + 6 + 469 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13504470 + ... + 13504926.

It is an arithmetic number, because the mean of its divisors is an integer number (116487720).

Almost surely, 2^6171646986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6171646986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7455214080).

6171646986 is an abundant number, since it is smaller than the sum of its proper divisors (8738781174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6171646986 is a wasteful number, since it uses less digits than its factorization.

6171646986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845 (or 839 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 6171646986 is about 78559.8306133612. The cubic root of 6171646986 is about 1834.2858911102.

The spelling of 6171646986 in words is "six billion, one hundred seventy-one million, six hundred forty-six thousand, nine hundred eighty-six".