66645928176 has 80 divisors (see below), whose sum is σ = 175722086400. Its totient is φ = 21761236224.

The previous prime is 66645928123. The next prime is 66645928183. The reversal of 66645928176 is 67182954666.

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, 412390 + ... + 550778.

It is an arithmetic number, because the mean of its divisors is an integer number (2196526080).

Almost surely, 2^66645928176 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 66645928176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87861043200).

66645928176 is an abundant number, since it is smaller than the sum of its proper divisors (109076158224).

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

66645928176 is a wasteful number, since it uses less digits than its factorization.

66645928176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138606 (or 138600 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 60.

The spelling of 66645928176 in words is "sixty-six billion, six hundred forty-five million, nine hundred twenty-eight thousand, one hundred seventy-six".