66688882 has 8 divisors (see below), whose sum is σ = 107728236. Its totient is φ = 30779472.

The previous prime is 66688873. The next prime is 66688903. The reversal of 66688882 is 28888666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55338721 + 11350161 = 7439^2 + 3369^2 .

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

It is an unprimeable number.

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, 1282453 + ... + 1282504.

Almost surely, 2^66688882 is an apocalyptic number.

66688882 is a deficient number, since it is larger than the sum of its proper divisors (41039354).

66688882 is a wasteful number, since it uses less digits than its factorization.

66688882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564972.

The product of its digits is 1769472, while the sum is 52.

The square root of 66688882 is about 8166.3261017424. The cubic root of 66688882 is about 405.5251674179.

The spelling of 66688882 in words is "sixty-six million, six hundred eighty-eight thousand, eight hundred eighty-two".