66847616 has 64 divisors (see below), whose sum is σ = 146622960. Its totient is φ = 30105600.

The previous prime is 66847609. The next prime is 66847661. The reversal of 66847616 is 61674866.

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

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277256 + ... + 277496.

Almost surely, 2^66847616 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 66847616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73311480).

66847616 is an abundant number, since it is smaller than the sum of its proper divisors (79775344).

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

66847616 is a wasteful number, since it uses less digits than its factorization.

66847616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 451 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 66847616 is about 8176.0391388496. The cubic root of 66847616 is about 405.8466584241.

It can be divided in two parts, 668 and 47616, that added together give a palindrome (48284).

The spelling of 66847616 in words is "sixty-six million, eight hundred forty-seven thousand, six hundred sixteen".