66636545 has 8 divisors (see below), whose sum is σ = 80061696. Its totient is φ = 53244016.

The previous prime is 66636533. The next prime is 66636551. The reversal of 66636545 is 54563666.

It is a happy number.

66636545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66636545 - 2⁸ = 66636289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3407 + ... + 12036.

It is an arithmetic number, because the mean of its divisors is an integer number (10007712).

Almost surely, 2^66636545 is an apocalyptic number.

It is an amenable number.

66636545 is a deficient number, since it is larger than the sum of its proper divisors (13425151).

66636545 is a wasteful number, since it uses less digits than its factorization.

66636545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16311.

The product of its digits is 388800, while the sum is 41.

The square root of 66636545 is about 8163.1210330363. The cubic root of 66636545 is about 405.4190551514.

The spelling of 66636545 in words is "sixty-six million, six hundred thirty-six thousand, five hundred forty-five".