8447771666 has 8 divisors (see below), whose sum is σ = 12700263024. Its totient is φ = 4214350660.

The previous prime is 8447771639. The next prime is 8447771669. The reversal of 8447771666 is 6661777448.

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

It is a super-2 number, since 2×8447771666² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8447771669) 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, 4766480 + ... + 4768251.

It is an arithmetic number, because the mean of its divisors is an integer number (1587532878).

Almost surely, 2^8447771666 is an apocalyptic number.

8447771666 is a deficient number, since it is larger than the sum of its proper divisors (4252491358).

8447771666 is a wasteful number, since it uses less digits than its factorization.

8447771666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9535176.

The product of its digits is 9483264, while the sum is 56.

The square root of 8447771666 is about 91911.7602159811. The cubic root of 8447771666 is about 2036.6389986565.

The spelling of 8447771666 in words is "eight billion, four hundred forty-seven million, seven hundred seventy-one thousand, six hundred sixty-six".