66504947 has 8 divisors (see below), whose sum is σ = 68845056. Its totient is φ = 64193472.

The previous prime is 66504943. The next prime is 66504989. The reversal of 66504947 is 74940566.

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 66504947 - 2² = 66504943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66504943) 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, 2378 + ... + 11775.

It is an arithmetic number, because the mean of its divisors is an integer number (8605632).

Almost surely, 2^66504947 is an apocalyptic number.

66504947 is a deficient number, since it is larger than the sum of its proper divisors (2340109).

66504947 is a wasteful number, since it uses less digits than its factorization.

66504947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14317.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 66504947 is about 8155.0565295404. The cubic root of 66504947 is about 405.1519970050.

The spelling of 66504947 in words is "sixty-six million, five hundred four thousand, nine hundred forty-seven".