66385648 has 40 divisors (see below), whose sum is σ = 147432032. Its totient is φ = 28366848.

The previous prime is 66385643. The next prime is 66385681. The reversal of 66385648 is 84658366.

It is a junction number, because it is equal to n+sod(n) for n = 66385598 and 66385607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66385643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50536 + ... + 51832.

Almost surely, 2^66385648 is an apocalyptic number.

It is an amenable number.

66385648 is an abundant number, since it is smaller than the sum of its proper divisors (81046384).

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

66385648 is a wasteful number, since it uses less digits than its factorization.

66385648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1763 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 66385648 is about 8147.7388274294. The cubic root of 66385648 is about 404.9095931922.

The spelling of 66385648 in words is "sixty-six million, three hundred eighty-five thousand, six hundred forty-eight".