66882391 has 4 divisors (see below), whose sum is σ = 67409152. Its totient is φ = 66355632.

The previous prime is 66882379. The next prime is 66882397. The reversal of 66882391 is 19328866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66882391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66882397) 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, 263190 + ... + 263443.

It is an arithmetic number, because the mean of its divisors is an integer number (16852288).

Almost surely, 2^66882391 is an apocalyptic number.

66882391 is a deficient number, since it is larger than the sum of its proper divisors (526761).

66882391 is a wasteful number, since it uses less digits than its factorization.

66882391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526760.

The product of its digits is 124416, while the sum is 43.

The square root of 66882391 is about 8178.1655033388. The cubic root of 66882391 is about 405.9170217958.

The spelling of 66882391 in words is "sixty-six million, eight hundred eighty-two thousand, three hundred ninety-one".