8666644442 has 4 divisors (see below), whose sum is σ = 12999966666. Its totient is φ = 4333322220.

The previous prime is 8666644417. The next prime is 8666644447. The reversal of 8666644442 is 2444466668.

8666644442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8085786241 + 580858201 = 89921^2 + 24101^2 .

It is a super-2 number, since 2×8666644442² (a number of 21 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (8666644447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2166661109 + ... + 2166661112.

Almost surely, 2^8666644442 is an apocalyptic number.

8666644442 is a deficient number, since it is larger than the sum of its proper divisors (4333322224).

8666644442 is a wasteful number, since it uses less digits than its factorization.

8666644442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4333322223.

The product of its digits is 5308416, while the sum is 50.

The square root of 8666644442 is about 93094.8142594420. The cubic root of 8666644442 is about 2054.0782934311.

The spelling of 8666644442 in words is "eight billion, six hundred sixty-six million, six hundred forty-four thousand, four hundred forty-two".