8666821610 has 16 divisors (see below), whose sum is σ = 15820002432. Its totient is φ = 3417901200.

The previous prime is 8666821609. The next prime is 8666821627. The reversal of 8666821610 is 161286668.

It is a super-2 number, since 2×8666821610² (a number of 21 digits) contains 22 as substring.

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, 6102686 + ... + 6104105.

It is an arithmetic number, because the mean of its divisors is an integer number (988750152).

Almost surely, 2^8666821610 is an apocalyptic number.

8666821610 is a deficient number, since it is larger than the sum of its proper divisors (7153180822).

8666821610 is a wasteful number, since it uses less digits than its factorization.

8666821610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12206869.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 8666821610 is about 93095.7658005991. The cubic root of 8666821610 is about 2054.0922901771.

The spelling of 8666821610 in words is "eight billion, six hundred sixty-six million, eight hundred twenty-one thousand, six hundred ten".