66856382 has 8 divisors (see below), whose sum is σ = 101222136. Its totient is φ = 33115672.

The previous prime is 66856351. The next prime is 66856399. The reversal of 66856382 is 28365866.

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

It is a congruent number.

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, 155993 + ... + 156420.

It is an arithmetic number, because the mean of its divisors is an integer number (12652767).

Almost surely, 2^66856382 is an apocalyptic number.

66856382 is a deficient number, since it is larger than the sum of its proper divisors (34365754).

66856382 is a wasteful number, since it uses less digits than its factorization.

66856382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312522.

The product of its digits is 414720, while the sum is 44.

The square root of 66856382 is about 8176.5751999233. The cubic root of 66856382 is about 405.8643977569.

The spelling of 66856382 in words is "sixty-six million, eight hundred fifty-six thousand, three hundred eighty-two".