6666575666161 has 4 divisors (see below), whose sum is σ = 6666734364400. Its totient is φ = 6666416967924.

The previous prime is 6666575666083. The next prime is 6666575666237. The reversal of 6666575666161 is 1616665756666.

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 6666575666161 - 2⁹ = 6666575665649 is a prime.

It is a super-2 number, since 2×6666575666161² (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 (6666575666561) 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, 79286091 + ... + 79370128.

It is an arithmetic number, because the mean of its divisors is an integer number (1666683591100).

Almost surely, 2^{6666575666161} is an apocalyptic number.

It is an amenable number.

6666575666161 is a deficient number, since it is larger than the sum of its proper divisors (158698239).

6666575666161 is a wasteful number, since it uses less digits than its factorization.

6666575666161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158698238.

The product of its digits is 293932800, while the sum is 67.

The spelling of 6666575666161 in words is "six trillion, six hundred sixty-six billion, five hundred seventy-five million, six hundred sixty-six thousand, one hundred sixty-one".