66170804065 has 8 divisors (see below), whose sum is σ = 79406521920. Its totient is φ = 52935605232.

The previous prime is 66170804053. The next prime is 66170804069. The reversal of 66170804065 is 56040807166.

It is a happy number.

66170804065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66170804065 - 2³⁵ = 31811065697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66170804069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253812 + ... + 443578.

It is an arithmetic number, because the mean of its divisors is an integer number (9925815240).

Almost surely, 2^66170804065 is an apocalyptic number.

It is an amenable number.

66170804065 is a deficient number, since it is larger than the sum of its proper divisors (13235717855).

66170804065 is a wasteful number, since it uses less digits than its factorization.

66170804065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259511.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 66170804065 in words is "sixty-six billion, one hundred seventy million, eight hundred four thousand, sixty-five".