8171665566 has 32 divisors (see below), whose sum is σ = 16609114368. Its totient is φ = 2679864960.

The previous prime is 8171665549. The next prime is 8171665573. The reversal of 8171665566 is 6655661718.

It is a super-2 number, since 2×8171665566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85975 + ... + 154061.

It is an arithmetic number, because the mean of its divisors is an integer number (519034824).

Almost surely, 2^8171665566 is an apocalyptic number.

8171665566 is an abundant number, since it is smaller than the sum of its proper divisors (8437448802).

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

8171665566 is a wasteful number, since it uses less digits than its factorization.

8171665566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68416.

The product of its digits is 1814400, while the sum is 51.

The square root of 8171665566 is about 90397.2652573074. The cubic root of 8171665566 is about 2014.2043433224.

The spelling of 8171665566 in words is "eight billion, one hundred seventy-one million, six hundred sixty-five thousand, five hundred sixty-six".