66445648 has 20 divisors (see below), whose sum is σ = 132892288. Its totient is φ = 32150880.

The previous prime is 66445627. The next prime is 66445649. The reversal of 66445648 is 84654466.

66445648 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66445649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66486 + ... + 67477.

Almost surely, 2^66445648 is an apocalyptic number.

It is an amenable number.

66445648 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66445648 is a wasteful number, since it uses less digits than its factorization.

66445648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134002 (or 133996 counting only the distinct ones).

The product of its digits is 552960, while the sum is 43.

The square root of 66445648 is about 8151.4199989940. The cubic root of 66445648 is about 405.0315435473.

The spelling of 66445648 in words is "sixty-six million, four hundred forty-five thousand, six hundred forty-eight".