66656047 has 8 divisors (see below), whose sum is σ = 73215360. Its totient is φ = 60401880.

The previous prime is 66656041. The next prime is 66656059. The reversal of 66656047 is 74065666.

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 66656047 - 2³ = 66656039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66656041) 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 7 ways as a sum of consecutive naturals, for example, 75829 + ... + 76702.

It is an arithmetic number, because the mean of its divisors is an integer number (9151920).

Almost surely, 2^66656047 is an apocalyptic number.

66656047 is a deficient number, since it is larger than the sum of its proper divisors (6559313).

66656047 is a wasteful number, since it uses less digits than its factorization.

66656047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152573.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 66656047 is about 8164.3154642628. The cubic root of 66656047 is about 405.4586015756.

The spelling of 66656047 in words is "sixty-six million, six hundred fifty-six thousand, forty-seven".