66573644 has 12 divisors (see below), whose sum is σ = 122635800. Its totient is φ = 31534848.

The previous prime is 66573641. The next prime is 66573673. The reversal of 66573644 is 44637566.

It is not an unprimeable number, because it can be changed into a prime (66573641) 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 3 ways as a sum of consecutive naturals, for example, 437909 + ... + 438060.

It is an arithmetic number, because the mean of its divisors is an integer number (10219650).

Almost surely, 2^66573644 is an apocalyptic number.

It is an amenable number.

66573644 is a deficient number, since it is larger than the sum of its proper divisors (56062156).

66573644 is a wasteful number, since it uses less digits than its factorization.

66573644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875992 (or 875990 counting only the distinct ones).

The product of its digits is 362880, while the sum is 41.

The square root of 66573644 is about 8159.2673690718. The cubic root of 66573644 is about 405.2914510362.

It can be divided in two parts, 6657 and 3644, that added together give a palindrome (10301).

The spelling of 66573644 in words is "sixty-six million, five hundred seventy-three thousand, six hundred forty-four".