66288291 has 4 divisors (see below), whose sum is σ = 88384392. Its totient is φ = 44192192.

The previous prime is 66288289. The next prime is 66288301. The reversal of 66288291 is 19288266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66288291 - 2¹ = 66288289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66288221) 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 3 ways as a sum of consecutive naturals, for example, 11048046 + ... + 11048051.

It is an arithmetic number, because the mean of its divisors is an integer number (22096098).

Almost surely, 2^66288291 is an apocalyptic number.

66288291 is a deficient number, since it is larger than the sum of its proper divisors (22096101).

66288291 is a wasteful number, since it uses less digits than its factorization.

66288291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22096100.

The product of its digits is 82944, while the sum is 42.

The square root of 66288291 is about 8141.7621557007. The cubic root of 66288291 is about 404.7115580705.

The spelling of 66288291 in words is "sixty-six million, two hundred eighty-eight thousand, two hundred ninety-one".