66187648 has 16 divisors (see below), whose sum is σ = 131858460. Its totient is φ = 33093760.

The previous prime is 66187643. The next prime is 66187663. The reversal of 66187648 is 84678166.

It is a happy number.

66187648 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 (16).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66187598 and 66187607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66187643) 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 as a sum of consecutive naturals, namely, 258418 + ... + 258673.

Almost surely, 2^66187648 is an apocalyptic number.

It is an amenable number.

66187648 is a deficient number, since it is larger than the sum of its proper divisors (65670812).

66187648 is an equidigital number, since it uses as much as digits as its factorization.

66187648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517105 (or 517093 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 66187648 is about 8135.5791434906. The cubic root of 66187648 is about 404.5066349195.

The spelling of 66187648 in words is "sixty-six million, one hundred eighty-seven thousand, six hundred forty-eight".