66447387360 has 144 divisors (see below), whose sum is σ = 227726042544. Its totient is φ = 17643165696.

The previous prime is 66447387341. The next prime is 66447387361. The reversal of 66447387360 is 6378374466.

It is a happy number.

66447387360 is a `hidden beast` number, since 6 + 64 + 473 + 87 + 36 + 0 = 666.

66447387360 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66447387297 and 66447387306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66447387361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236499 + ... + 434541.

It is an arithmetic number, because the mean of its divisors is an integer number (1581430851).

Almost surely, 2^66447387360 is an apocalyptic number.

66447387360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66447387360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113863021272).

66447387360 is an abundant number, since it is smaller than the sum of its proper divisors (161278655184).

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

66447387360 is a wasteful number, since it uses less digits than its factorization.

66447387360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198297 (or 198286 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 54.

The spelling of 66447387360 in words is "sixty-six billion, four hundred forty-seven million, three hundred eighty-seven thousand, three hundred sixty".