66288909 has 8 divisors (see below), whose sum is σ = 88607232. Its totient is φ = 44081600.

The previous prime is 66288907. The next prime is 66288913. The reversal of 66288909 is 90988266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66288909 - 2¹ = 66288907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66288907) 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 7 ways as a sum of consecutive naturals, for example, 26349 + ... + 28754.

It is an arithmetic number, because the mean of its divisors is an integer number (11075904).

Almost surely, 2^66288909 is an apocalyptic number.

It is an amenable number.

66288909 is a deficient number, since it is larger than the sum of its proper divisors (22318323).

66288909 is a wasteful number, since it uses less digits than its factorization.

66288909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55507.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 66288909 is about 8141.8001080842. The cubic root of 66288909 is about 404.7128157635.

The spelling of 66288909 in words is "sixty-six million, two hundred eighty-eight thousand, nine hundred nine".