66290489 has 2 divisors, whose sum is σ = 66290490. Its totient is φ = 66290488.

The previous prime is 66290461. The next prime is 66290501. The reversal of 66290489 is 98409266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58782889 + 7507600 = 7667^2 + 2740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66290489 is a prime.

It is not a weakly prime, because it can be changed into another prime (66292489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33145244 + 33145245.

It is an arithmetic number, because the mean of its divisors is an integer number (33145245).

Almost surely, 2^66290489 is an apocalyptic number.

It is an amenable number.

66290489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66290489 is an equidigital number, since it uses as much as digits as its factorization.

66290489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 66290489 is about 8141.8971376455. The cubic root of 66290489 is about 404.7160311891.

The spelling of 66290489 in words is "sixty-six million, two hundred ninety thousand, four hundred eighty-nine".