66004541 has 2 divisors, whose sum is σ = 66004542. Its totient is φ = 66004540.

The previous prime is 66004531. The next prime is 66004607. The reversal of 66004541 is 14540066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51912025 + 14092516 = 7205^2 + 3754^2 .

It is a cyclic number.

It is not a de Polignac number, because 66004541 - 2²² = 61810237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66004541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66004531) 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 as a sum of consecutive naturals, namely, 33002270 + 33002271.

It is an arithmetic number, because the mean of its divisors is an integer number (33002271).

Almost surely, 2^66004541 is an apocalyptic number.

It is an amenable number.

66004541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66004541 is an equidigital number, since it uses as much as digits as its factorization.

66004541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66004541 is about 8124.3178790591. The cubic root of 66004541 is about 404.1332701683.

The spelling of 66004541 in words is "sixty-six million, four thousand, five hundred forty-one".