66660344 has 8 divisors (see below), whose sum is σ = 124988160. Its totient is φ = 33330168.

The previous prime is 66660343. The next prime is 66660353. The reversal of 66660344 is 44306666.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660343) 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 as a sum of consecutive naturals, namely, 4166264 + ... + 4166279.

It is an arithmetic number, because the mean of its divisors is an integer number (15623520).

Almost surely, 2^66660344 is an apocalyptic number.

It is an amenable number.

66660344 is a deficient number, since it is larger than the sum of its proper divisors (58327816).

66660344 is a wasteful number, since it uses less digits than its factorization.

66660344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332549 (or 8332545 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 66660344 is about 8164.5786174180. The cubic root of 66660344 is about 405.4673140544.

The spelling of 66660344 in words is "sixty-six million, six hundred sixty thousand, three hundred forty-four".