66466647 has 12 divisors (see below), whose sum is σ = 103392744. Its totient is φ = 40902480.

The previous prime is 66466643. The next prime is 66466661. The reversal of 66466647 is 74666466.

It is not a de Polignac number, because 66466647 - 2² = 66466643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66466643) 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 11 ways as a sum of consecutive naturals, for example, 283929 + ... + 284162.

It is an arithmetic number, because the mean of its divisors is an integer number (8616062).

Almost surely, 2^66466647 is an apocalyptic number.

66466647 is a deficient number, since it is larger than the sum of its proper divisors (36926097).

66466647 is a wasteful number, since it uses less digits than its factorization.

66466647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568110 (or 568107 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 66466647 is about 8152.7079550294. The cubic root of 66466647 is about 405.0742067957.

The spelling of 66466647 in words is "sixty-six million, four hundred sixty-six thousand, six hundred forty-seven".