66863189 has 2 divisors, whose sum is σ = 66863190. Its totient is φ = 66863188.

The previous prime is 66863177. The next prime is 66863201. The reversal of 66863189 is 98136866.

66863189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (66863177) and next prime (66863201).

It can be written as a sum of positive squares in only one way, i.e., 34316164 + 32547025 = 5858^2 + 5705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66863189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66863129) 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, 33431594 + 33431595.

It is an arithmetic number, because the mean of its divisors is an integer number (33431595).

Almost surely, 2^66863189 is an apocalyptic number.

It is an amenable number.

66863189 is a deficient number, since it is larger than the sum of its proper divisors (1).

66863189 is an equidigital number, since it uses as much as digits as its factorization.

66863189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 66863189 is about 8176.9914393987. The cubic root of 66863189 is about 405.8781716860.

The spelling of 66863189 in words is "sixty-six million, eight hundred sixty-three thousand, one hundred eighty-nine".