66566945 has 8 divisors (see below), whose sum is σ = 83353536. Its totient is φ = 50938096.

The previous prime is 66566939. The next prime is 66566971. The reversal of 66566945 is 54966566.

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 66566945 - 2¹² = 66562849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66566945.

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, 289307 + ... + 289536.

It is an arithmetic number, because the mean of its divisors is an integer number (10419192).

Almost surely, 2^66566945 is an apocalyptic number.

It is an amenable number.

66566945 is a deficient number, since it is larger than the sum of its proper divisors (16786591).

66566945 is a wasteful number, since it uses less digits than its factorization.

66566945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578871.

The product of its digits is 1166400, while the sum is 47.

The square root of 66566945 is about 8158.8568439457. The cubic root of 66566945 is about 405.2778563745.

The spelling of 66566945 in words is "sixty-six million, five hundred sixty-six thousand, nine hundred forty-five".