66678355 has 8 divisors (see below), whose sum is σ = 80913600. Its totient is φ = 52742976.

The previous prime is 66678347. The next prime is 66678379. The reversal of 66678355 is 55387666.

It is a happy number.

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 66678355 - 2³ = 66678347 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 74475 + ... + 75364.

It is an arithmetic number, because the mean of its divisors is an integer number (10114200).

Almost surely, 2^66678355 is an apocalyptic number.

66678355 is a deficient number, since it is larger than the sum of its proper divisors (14235245).

66678355 is a wasteful number, since it uses less digits than its factorization.

66678355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149933.

The product of its digits is 907200, while the sum is 46.

The square root of 66678355 is about 8165.6815392226. The cubic root of 66678355 is about 405.5038285882.

The spelling of 66678355 in words is "sixty-six million, six hundred seventy-eight thousand, three hundred fifty-five".