6606663997 has 4 divisors (see below), whose sum is σ = 6614653536. Its totient is φ = 6598674460.

The previous prime is 6606663991. The next prime is 6606664013. The reversal of 6606663997 is 7993666066.

6606663997 is digitally balanced in base 3, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6606663997 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6606663991) by changing a digit.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3993529 + ... + 3995182.

It is an arithmetic number, because the mean of its divisors is an integer number (1653663384).

Almost surely, 2^6606663997 is an apocalyptic number.

It is an amenable number.

6606663997 is a deficient number, since it is larger than the sum of its proper divisors (7989539).

6606663997 is an equidigital number, since it uses as much as digits as its factorization.

6606663997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7989538.

The product of its (nonzero) digits is 13226976, while the sum is 58.

The square root of 6606663997 is about 81281.3877649736. The cubic root of 6606663997 is about 1876.4085649914.

The spelling of 6606663997 in words is "six billion, six hundred six million, six hundred sixty-three thousand, nine hundred ninety-seven".