66606384416 has 96 divisors (see below), whose sum is σ = 154302781248. Its totient is φ = 27902039040.

The previous prime is 66606384409. The next prime is 66606384419. The reversal of 66606384416 is 61448360666.

It is a super-2 number, since 2×66606384416² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66606384419) 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, 2931050 + ... + 2953686.

It is an arithmetic number, because the mean of its divisors is an integer number (1607320638).

Almost surely, 2^66606384416 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 66606384416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77151390624).

66606384416 is an abundant number, since it is smaller than the sum of its proper divisors (87696396832).

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

66606384416 is a wasteful number, since it uses less digits than its factorization.

66606384416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23314 (or 23306 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 50.

The spelling of 66606384416 in words is "sixty-six billion, six hundred six million, three hundred eighty-four thousand, four hundred sixteen".