66724275 has 12 divisors (see below), whose sum is σ = 110317592. Its totient is φ = 35586240.

The previous prime is 66724271. The next prime is 66724277. The reversal of 66724275 is 57242766.

It is a happy number.

It is not a de Polignac number, because 66724275 - 2² = 66724271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66724271) 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, 444754 + ... + 444903.

Almost surely, 2^66724275 is an apocalyptic number.

66724275 is a deficient number, since it is larger than the sum of its proper divisors (43593317).

66724275 is a wasteful number, since it uses less digits than its factorization.

66724275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889670 (or 889665 counting only the distinct ones).

The product of its digits is 141120, while the sum is 39.

The square root of 66724275 is about 8168.4928230366. The cubic root of 66724275 is about 405.5968945858.

It can be divided in two parts, 667 and 24275, that added together give a palindrome (24942).

The spelling of 66724275 in words is "sixty-six million, seven hundred twenty-four thousand, two hundred seventy-five".