664416541 has 2 divisors, whose sum is σ = 664416542. Its totient is φ = 664416540.

The previous prime is 664416517. The next prime is 664416547. The reversal of 664416541 is 145614466.

664416541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480705625 + 183710916 = 21925^2 + 13554^2 .

It is a cyclic number.

It is not a de Polignac number, because 664416541 - 2¹⁷ = 664285469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664416541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664416547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332208270 + 332208271.

It is an arithmetic number, because the mean of its divisors is an integer number (332208271).

Almost surely, 2^664416541 is an apocalyptic number.

It is an amenable number.

664416541 is a deficient number, since it is larger than the sum of its proper divisors (1).

664416541 is an equidigital number, since it uses as much as digits as its factorization.

664416541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 37.

The square root of 664416541 is about 25776.2786491766. The cubic root of 664416541 is about 872.5965239966.

The spelling of 664416541 in words is "six hundred sixty-four million, four hundred sixteen thousand, five hundred forty-one".