6669601609609 has 4 divisors (see below), whose sum is σ = 6669606905104. Its totient is φ = 6669596314116.

The previous prime is 6669601609523. The next prime is 6669601609691. The reversal of 6669601609609 is 9069061069666.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6669601609609 - 2²⁵ = 6669568055177 is a prime.

It is a super-2 number, since 2×6669601609609² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6669601600609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447994 + ... + 3679660.

It is an arithmetic number, because the mean of its divisors is an integer number (1667401726276).

Almost surely, 2^{6669601609609} is an apocalyptic number.

It is an amenable number.

6669601609609 is a deficient number, since it is larger than the sum of its proper divisors (5295495).

6669601609609 is a wasteful number, since it uses less digits than its factorization.

6669601609609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5295494.

The product of its (nonzero) digits is 34012224, while the sum is 64.

The spelling of 6669601609609 in words is "six trillion, six hundred sixty-nine billion, six hundred one million, six hundred nine thousand, six hundred nine".