66660047 has 8 divisors (see below), whose sum is σ = 67158000. Its totient is φ = 66164544.

The previous prime is 66659993. The next prime is 66660059. The reversal of 66660047 is 74006666.

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 66660047 - 2¹² = 66655951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66659989 and 66660016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660947) 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, 142508 + ... + 142974.

It is an arithmetic number, because the mean of its divisors is an integer number (8394750).

Almost surely, 2^66660047 is an apocalyptic number.

66660047 is a deficient number, since it is larger than the sum of its proper divisors (497953).

66660047 is a wasteful number, since it uses less digits than its factorization.

66660047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 66660047 is about 8164.5604290739. The cubic root of 66660047 is about 405.4667118774.

The spelling of 66660047 in words is "sixty-six million, six hundred sixty thousand, forty-seven".