66240275 has 6 divisors (see below), whose sum is σ = 82137972. Its totient is φ = 52992200.

The previous prime is 66240257. The next prime is 66240277. The reversal of 66240275 is 57204266.

It is not a de Polignac number, because 66240275 - 2¹⁸ = 65978131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66240277) 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 5 ways as a sum of consecutive naturals, for example, 1324781 + ... + 1324830.

It is an arithmetic number, because the mean of its divisors is an integer number (13689662).

Almost surely, 2^66240275 is an apocalyptic number.

66240275 is a deficient number, since it is larger than the sum of its proper divisors (15897697).

66240275 is a wasteful number, since it uses less digits than its factorization.

66240275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649621 (or 2649616 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 66240275 is about 8138.8128741236. The cubic root of 66240275 is about 404.6138167058.

The spelling of 66240275 in words is "sixty-six million, two hundred forty thousand, two hundred seventy-five".