66244375 has 20 divisors (see below), whose sum is σ = 83841912. Its totient is φ = 52316000.

The previous prime is 66244369. The next prime is 66244379. The reversal of 66244375 is 57344266.

It is not a de Polignac number, because 66244375 - 2¹¹ = 66242327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66244379) 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 19 ways as a sum of consecutive naturals, for example, 51237 + ... + 52513.

Almost surely, 2^66244375 is an apocalyptic number.

66244375 is a deficient number, since it is larger than the sum of its proper divisors (17597537).

66244375 is an equidigital number, since it uses as much as digits as its factorization.

66244375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380 (or 1365 counting only the distinct ones).

The product of its digits is 120960, while the sum is 37.

The square root of 66244375 is about 8139.0647497117. The cubic root of 66244375 is about 404.6221645094.

The spelling of 66244375 in words is "sixty-six million, two hundred forty-four thousand, three hundred seventy-five".