65666570571166 has 16 divisors (see below), whose sum is σ = 101897008596000. Its totient is φ = 31700914505568.

The previous prime is 65666570571149. The next prime is 65666570571197. The reversal of 65666570571166 is 66117507566656.

It is a happy number.

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, 6728935 + ... + 13289533.

It is an arithmetic number, because the mean of its divisors is an integer number (6368563037250).

Almost surely, 2^{65666570571166} is an apocalyptic number.

65666570571166 is a deficient number, since it is larger than the sum of its proper divisors (36230438024834).

65666570571166 is a wasteful number, since it uses less digits than its factorization.

65666570571166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733203.

The product of its (nonzero) digits is 285768000, while the sum is 67.

The spelling of 65666570571166 in words is "sixty-five trillion, six hundred sixty-six billion, five hundred seventy million, five hundred seventy-one thousand, one hundred sixty-six".