66944275 has 12 divisors (see below), whose sum is σ = 83648664. Its totient is φ = 53144000.

The previous prime is 66944261. The next prime is 66944279. The reversal of 66944275 is 57244966.

It is a happy number.

It is not a de Polignac number, because 66944275 - 2⁵ = 66944243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66944279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6946 + ... + 13495.

It is an arithmetic number, because the mean of its divisors is an integer number (6970722).

Almost surely, 2^66944275 is an apocalyptic number.

66944275 is a deficient number, since it is larger than the sum of its proper divisors (16704389).

66944275 is a wasteful number, since it uses less digits than its factorization.

66944275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20582 (or 20577 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 66944275 is about 8181.9481176551. The cubic root of 66944275 is about 406.0421769380.

It can be divided in two parts, 669 and 44275, that added together give a palindrome (44944).

The spelling of 66944275 in words is "sixty-six million, nine hundred forty-four thousand, two hundred seventy-five".