66488489 has 2 divisors, whose sum is σ = 66488490. Its totient is φ = 66488488.

The previous prime is 66488453. The next prime is 66488491. The reversal of 66488489 is 98488466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59290000 + 7198489 = 7700^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 66488489 - 2¹² = 66484393 is a prime.

It is a Sophie Germain prime.

Together with 66488491, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 66488489.

It is not a weakly prime, because it can be changed into another prime (66488689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33244244 + 33244245.

It is an arithmetic number, because the mean of its divisors is an integer number (33244245).

Almost surely, 2^66488489 is an apocalyptic number.

It is an amenable number.

66488489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66488489 is an equidigital number, since it uses as much as digits as its factorization.

66488489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 53.

The square root of 66488489 is about 8154.0473999113. The cubic root of 66488489 is about 405.1185732173.

The spelling of 66488489 in words is "sixty-six million, four hundred eighty-eight thousand, four hundred eighty-nine".