66311489 has 2 divisors, whose sum is σ = 66311490. Its totient is φ = 66311488.

The previous prime is 66311447. The next prime is 66311513. The reversal of 66311489 is 98411366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57638464 + 8673025 = 7592^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 66311489 - 2¹² = 66307393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66314489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33155744 + 33155745.

It is an arithmetic number, because the mean of its divisors is an integer number (33155745).

Almost surely, 2^66311489 is an apocalyptic number.

It is an amenable number.

66311489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66311489 is an equidigital number, since it uses as much as digits as its factorization.

66311489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 66311489 is about 8143.1866612525. The cubic root of 66311489 is about 404.7587630072.

The spelling of 66311489 in words is "sixty-six million, three hundred eleven thousand, four hundred eighty-nine".