5665221066 has 64 divisors (see below), whose sum is σ = 12201477120. Its totient is φ = 1747173120.

The previous prime is 5665221059. The next prime is 5665221109. The reversal of 5665221066 is 6601225665.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3033465 + ... + 3035331.

It is an arithmetic number, because the mean of its divisors is an integer number (190648080).

Almost surely, 2^5665221066 is an apocalyptic number.

5665221066 is an abundant number, since it is smaller than the sum of its proper divisors (6536256054).

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

5665221066 is a wasteful number, since it uses less digits than its factorization.

5665221066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2379.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 5665221066 is about 75267.6628174411. The cubic root of 5665221066 is about 1782.6754642246.

The spelling of 5665221066 in words is "five billion, six hundred sixty-five million, two hundred twenty-one thousand, sixty-six".