66663275 has 18 divisors (see below), whose sum is σ = 96160140. Its totient is φ = 45711120.

The previous prime is 66663271. The next prime is 66663283. The reversal of 66663275 is 57236666.

It is not a de Polignac number, because 66663275 - 2² = 66663271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66663271) 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 17 ways as a sum of consecutive naturals, for example, 25985 + ... + 28434.

It is an arithmetic number, because the mean of its divisors is an integer number (5342230).

Almost surely, 2^66663275 is an apocalyptic number.

66663275 is a deficient number, since it is larger than the sum of its proper divisors (29496865).

66663275 is a wasteful number, since it uses less digits than its factorization.

66663275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54443 (or 54431 counting only the distinct ones).

The product of its digits is 272160, while the sum is 41.

The square root of 66663275 is about 8164.7581103178. The cubic root of 66663275 is about 405.4732566544.

The spelling of 66663275 in words is "sixty-six million, six hundred sixty-three thousand, two hundred seventy-five".