6663016661 has 4 divisors (see below), whose sum is σ = 7614876192. Its totient is φ = 5711157132.

The previous prime is 6663016639. The next prime is 6663016681. The reversal of 6663016661 is 1666103666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6663016661 - 2²⁶ = 6595907797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663016681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475929755 + ... + 475929768.

It is an arithmetic number, because the mean of its divisors is an integer number (1903719048).

Almost surely, 2^6663016661 is an apocalyptic number.

It is an amenable number.

6663016661 is a deficient number, since it is larger than the sum of its proper divisors (951859531).

6663016661 is an equidigital number, since it uses as much as digits as its factorization.

6663016661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951859530.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 6663016661 is about 81627.3034039469. The cubic root of 6663016661 is about 1881.7285163742.

The spelling of 6663016661 in words is "six billion, six hundred sixty-three million, sixteen thousand, six hundred sixty-one".