66544120 has 32 divisors (see below), whose sum is σ = 158533200. Its totient is φ = 25051648.

The previous prime is 66544031. The next prime is 66544139. The reversal of 66544120 is 2144566.

It is a congruent number.

It is an unprimeable number.

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, 48250 + ... + 49609.

Almost surely, 2^66544120 is an apocalyptic number.

It is an amenable number.

66544120 is an abundant number, since it is smaller than the sum of its proper divisors (91989080).

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

66544120 is a wasteful number, since it uses less digits than its factorization.

66544120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97887 (or 97883 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 66544120 is about 8157.4579373724. The cubic root of 66544120 is about 405.2315294547.

Adding to 66544120 its reverse (2144566), we get a palindrome (68688686).

The spelling of 66544120 in words is "sixty-six million, five hundred forty-four thousand, one hundred twenty".