66713172352 has 64 divisors (see below), whose sum is σ = 140796230400. Its totient is φ = 31378120704.

The previous prime is 66713172347. The next prime is 66713172371. The reversal of 66713172352 is 25327131766.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 66713172299 and 66713172308.

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, 4865218 + ... + 4878910.

It is an arithmetic number, because the mean of its divisors is an integer number (2199941100).

Almost surely, 2^66713172352 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 66713172352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70398115200).

66713172352 is an abundant number, since it is smaller than the sum of its proper divisors (74083058048).

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

66713172352 is a wasteful number, since it uses less digits than its factorization.

66713172352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15963 (or 15951 counting only the distinct ones).

The product of its digits is 317520, while the sum is 43.

The spelling of 66713172352 in words is "sixty-six billion, seven hundred thirteen million, one hundred seventy-two thousand, three hundred fifty-two".