66990089 has 2 divisors, whose sum is σ = 66990090. Its totient is φ = 66990088.

The previous prime is 66990071. The next prime is 66990103. The reversal of 66990089 is 98009966.

It is a happy number.

66990089 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., 37613689 + 29376400 = 6133^2 + 5420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66990089 is a prime.

It is not a weakly prime, because it can be changed into another prime (66990059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33495044 + 33495045.

It is an arithmetic number, because the mean of its divisors is an integer number (33495045).

Almost surely, 2^66990089 is an apocalyptic number.

It is an amenable number.

66990089 is a deficient number, since it is larger than the sum of its proper divisors (1).

66990089 is an equidigital number, since it uses as much as digits as its factorization.

66990089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 66990089 is about 8184.7473388004. The cubic root of 66990089 is about 406.1347821897.

The spelling of 66990089 in words is "sixty-six million, nine hundred ninety thousand, eighty-nine".