5666642665 has 8 divisors (see below), whose sum is σ = 6815118600. Its totient is φ = 4523215872.

The previous prime is 5666642633. The next prime is 5666642689. The reversal of 5666642665 is 5662466665.

It can be written as a sum of positive squares in 4 ways, for example, as 1684527849 + 3982114816 = 41043^2 + 63104^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5666642665 - 2⁵ = 5666642633 is a prime.

It is a super-2 number, since 2×5666642665² = 64221678185596604450, which 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, 1259814 + ... + 1264303.

It is an arithmetic number, because the mean of its divisors is an integer number (851889825).

Almost surely, 2^5666642665 is an apocalyptic number.

It is an amenable number.

5666642665 is a deficient number, since it is larger than the sum of its proper divisors (1148475935).

5666642665 is a wasteful number, since it uses less digits than its factorization.

5666642665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524571.

The product of its digits is 9331200, while the sum is 52.

The square root of 5666642665 is about 75277.1058489897. The cubic root of 5666642665 is about 1782.8245633024.

The spelling of 5666642665 in words is "five billion, six hundred sixty-six million, six hundred forty-two thousand, six hundred sixty-five".