66690089 has 2 divisors, whose sum is σ = 66690090. Its totient is φ = 66690088.

The previous prime is 66690073. The next prime is 66690097. The reversal of 66690089 is 98009666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42680089 + 24010000 = 6533^2 + 4900^2 .

It is a cyclic number.

It is not a de Polignac number, because 66690089 - 2⁴ = 66690073 is a prime.

It is not a weakly prime, because it can be changed into another prime (66690389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33345044 + 33345045.

It is an arithmetic number, because the mean of its divisors is an integer number (33345045).

Almost surely, 2^66690089 is an apocalyptic number.

It is an amenable number.

66690089 is a deficient number, since it is larger than the sum of its proper divisors (1).

66690089 is an equidigital number, since it uses as much as digits as its factorization.

66690089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 66690089 is about 8166.4000024491. The cubic root of 66690089 is about 405.5276139323.

The spelling of 66690089 in words is "sixty-six million, six hundred ninety thousand, eighty-nine".