660016541 has 2 divisors, whose sum is σ = 660016542. Its totient is φ = 660016540.

The previous prime is 660016501. The next prime is 660016549. The reversal of 660016541 is 145610066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433514041 + 226502500 = 20821^2 + 15050^2 .

It is a cyclic number.

It is not a de Polignac number, because 660016541 - 2⁶ = 660016477 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660016549) 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, 330008270 + 330008271.

It is an arithmetic number, because the mean of its divisors is an integer number (330008271).

Almost surely, 2^660016541 is an apocalyptic number.

It is an amenable number.

660016541 is a deficient number, since it is larger than the sum of its proper divisors (1).

660016541 is an equidigital number, since it uses as much as digits as its factorization.

660016541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 660016541 is about 25690.7870840891. The cubic root of 660016541 is about 870.6660425751. Note that the first 3 decimals are identical.

The spelling of 660016541 in words is "six hundred sixty million, sixteen thousand, five hundred forty-one".