8665566020 has 24 divisors (see below), whose sum is σ = 18988893504. Its totient is φ = 3315520736.

The previous prime is 8665566017. The next prime is 8665566023. The reversal of 8665566020 is 206655668.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8665566017) and next prime (8665566023).

It is not an unprimeable number, because it can be changed into a prime (8665566023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9418634 + ... + 9419553.

It is an arithmetic number, because the mean of its divisors is an integer number (791203896).

Almost surely, 2^8665566020 is an apocalyptic number.

It is an amenable number.

8665566020 is an abundant number, since it is smaller than the sum of its proper divisors (10323327484).

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

8665566020 is a wasteful number, since it uses less digits than its factorization.

8665566020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18838219 (or 18838217 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 8665566020 is about 93089.0220165622. The cubic root of 8665566020 is about 2053.9930910931.

The spelling of 8665566020 in words is "eight billion, six hundred sixty-five million, five hundred sixty-six thousand, twenty".