6666326655609 has 16 divisors (see below), whose sum is σ = 8937647161344. Its totient is φ = 4419625894800.

The previous prime is 6666326655577. The next prime is 6666326655613. The reversal of 6666326655609 is 9065566236666.

It is not a de Polignac number, because 6666326655609 - 2⁵ = 6666326655577 is a prime.

It is a super-2 number, since 2×6666326655609² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6666326655609.

It is not an unprimeable number, because it can be changed into a prime (6666326655619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175474 + ... + 3655604.

It is an arithmetic number, because the mean of its divisors is an integer number (558602947584).

Almost surely, 2^{6666326655609} is an apocalyptic number.

It is an amenable number.

6666326655609 is a deficient number, since it is larger than the sum of its proper divisors (2271320505735).

6666326655609 is a wasteful number, since it uses less digits than its factorization.

6666326655609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483668.

The product of its (nonzero) digits is 377913600, while the sum is 66.

The spelling of 6666326655609 in words is "six trillion, six hundred sixty-six billion, three hundred twenty-six million, six hundred fifty-five thousand, six hundred nine".