66189648 has 40 divisors (see below), whose sum is σ = 195418048. Its totient is φ = 18911232.

The previous prime is 66189623. The next prime is 66189649. The reversal of 66189648 is 84698166.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 66189597 and 66189606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66189649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98161 + ... + 98832.

Almost surely, 2^66189648 is an apocalyptic number.

It is an amenable number.

66189648 is an abundant number, since it is smaller than the sum of its proper divisors (129228400).

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

66189648 is a wasteful number, since it uses less digits than its factorization.

66189648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197011 (or 197005 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 66189648 is about 8135.7020594415. The cubic root of 66189648 is about 404.5107092201.

It can be divided in two parts, 661 and 89648, that added together give a palindrome (90309).

The spelling of 66189648 in words is "sixty-six million, one hundred eighty-nine thousand, six hundred forty-eight".