66403275 has 24 divisors (see below), whose sum is σ = 116247024. Its totient is φ = 33331200.

The previous prime is 66403273. The next prime is 66403279. The reversal of 66403275 is 57230466.

It is not a de Polignac number, because 66403275 - 2¹ = 66403273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66403273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24766 + ... + 27315.

It is an arithmetic number, because the mean of its divisors is an integer number (4843626).

Almost surely, 2^66403275 is an apocalyptic number.

66403275 is a deficient number, since it is larger than the sum of its proper divisors (49843749).

66403275 is a wasteful number, since it uses less digits than its factorization.

66403275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52111 (or 52106 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 66403275 is about 8148.8204667915. The cubic root of 66403275 is about 404.9454277940.

The spelling of 66403275 in words is "sixty-six million, four hundred three thousand, two hundred seventy-five".