8166509868 has 24 divisors (see below), whose sum is σ = 20787480000. Its totient is φ = 2474699920.

The previous prime is 8166509849. The next prime is 8166509899. The reversal of 8166509868 is 8689056618.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30933618 + ... + 30933881.

It is an arithmetic number, because the mean of its divisors is an integer number (866145000).

Almost surely, 2^8166509868 is an apocalyptic number.

It is an amenable number.

8166509868 is an abundant number, since it is smaller than the sum of its proper divisors (12620970132).

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

8166509868 is a wasteful number, since it uses less digits than its factorization.

8166509868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61867517 (or 61867515 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 57.

The square root of 8166509868 is about 90368.7438664498. The cubic root of 8166509868 is about 2013.7806510752.

The spelling of 8166509868 in words is "eight billion, one hundred sixty-six million, five hundred nine thousand, eight hundred sixty-eight".