66147680 has 96 divisors (see below), whose sum is σ = 168031584. Its totient is φ = 24518656.

The previous prime is 66147677. The next prime is 66147689. The reversal of 66147680 is 8674166.

66147680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66147689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225614 + ... + 225906.

It is an arithmetic number, because the mean of its divisors is an integer number (1750329).

Almost surely, 2^66147680 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 66147680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84015792).

66147680 is an abundant number, since it is smaller than the sum of its proper divisors (101883904).

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

66147680 is a wasteful number, since it uses less digits than its factorization.

66147680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 66147680 is about 8133.1224016364. The cubic root of 66147680 is about 404.4251968817.

The spelling of 66147680 in words is "sixty-six million, one hundred forty-seven thousand, six hundred eighty".