66847780272 has 320 divisors, whose sum is σ = 216466145280. Its totient is φ = 17306956800.

The previous prime is 66847780271. The next prime is 66847780283. The reversal of 66847780272 is 27208774866.

It is not an unprimeable number, because it can be changed into a prime (66847780271) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 136145947 + ... + 136146437.

It is an arithmetic number, because the mean of its divisors is an integer number (676456704).

Almost surely, 2^66847780272 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 66847780272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108233072640).

66847780272 is an abundant number, since it is smaller than the sum of its proper divisors (149618365008).

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

66847780272 is a wasteful number, since it uses less digits than its factorization.

66847780272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 12644352, while the sum is 57.

The spelling of 66847780272 in words is "sixty-six billion, eight hundred forty-seven million, seven hundred eighty thousand, two hundred seventy-two".