66170718064 has 80 divisors (see below), whose sum is σ = 141070792320. Its totient is φ = 29818446080.

The previous prime is 66170718017. The next prime is 66170718137. The reversal of 66170718064 is 46081707166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10928862 + ... + 10934914.

It is an arithmetic number, because the mean of its divisors is an integer number (1763384904).

Almost surely, 2^66170718064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66170718064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70535396160).

66170718064 is an abundant number, since it is smaller than the sum of its proper divisors (74900074256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66170718064 is a wasteful number, since it uses less digits than its factorization.

66170718064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6598 (or 6592 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 66170718064 in words is "sixty-six billion, one hundred seventy million, seven hundred eighteen thousand, sixty-four".