66665611165 has 8 divisors (see below), whose sum is σ = 80746385760. Its totient is φ = 52834054032.

The previous prime is 66665611153. The next prime is 66665611171. The reversal of 66665611165 is 56111656666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66665611165 - 2⁷ = 66665611037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62303775 + ... + 62304844.

It is an arithmetic number, because the mean of its divisors is an integer number (10093298220).

Almost surely, 2^66665611165 is an apocalyptic number.

It is an amenable number.

66665611165 is a deficient number, since it is larger than the sum of its proper divisors (14080774595).

66665611165 is a wasteful number, since it uses less digits than its factorization.

66665611165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124608731.

The product of its digits is 1166400, while the sum is 49.

The spelling of 66665611165 in words is "sixty-six billion, six hundred sixty-five million, six hundred eleven thousand, one hundred sixty-five".