66557232 has 60 divisors (see below), whose sum is σ = 212880720. Its totient is φ = 19016064.

The previous prime is 66557221. The next prime is 66557237. The reversal of 66557232 is 23275566.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66557237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32007 + ... + 34022.

It is an arithmetic number, because the mean of its divisors is an integer number (3548012).

Almost surely, 2^66557232 is an apocalyptic number.

It is an amenable number.

66557232 is an abundant number, since it is smaller than the sum of its proper divisors (146323488).

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

66557232 is a wasteful number, since it uses less digits than its factorization.

66557232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66050 (or 66041 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 66557232 is about 8158.2615795278. The cubic root of 66557232 is about 405.2581436112.

The spelling of 66557232 in words is "sixty-six million, five hundred fifty-seven thousand, two hundred thirty-two".