66506044 has 24 divisors (see below), whose sum is σ = 127714608. Its totient is φ = 30051840.

The previous prime is 66506029. The next prime is 66506047. The reversal of 66506044 is 44060566.

It is a junction number, because it is equal to n+sod(n) for n = 66505997 and 66506015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66506047) 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, 3244 + ... + 11980.

It is an arithmetic number, because the mean of its divisors is an integer number (5321442).

Almost surely, 2^66506044 is an apocalyptic number.

It is an amenable number.

66506044 is a deficient number, since it is larger than the sum of its proper divisors (61208564).

66506044 is a wasteful number, since it uses less digits than its factorization.

66506044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8925 (or 8923 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66506044 is about 8155.1237881469. The cubic root of 66506044 is about 405.1542246553.

The spelling of 66506044 in words is "sixty-six million, five hundred six thousand, forty-four".