66967189 has 2 divisors, whose sum is σ = 66967190. Its totient is φ = 66967188.

The previous prime is 66967181. The next prime is 66967259. The reversal of 66967189 is 98176966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33524100 + 33443089 = 5790^2 + 5783^2 .

It is a cyclic number.

It is not a de Polignac number, because 66967189 - 2³ = 66967181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66967181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33483594 + 33483595.

It is an arithmetic number, because the mean of its divisors is an integer number (33483595).

Almost surely, 2^66967189 is an apocalyptic number.

It is an amenable number.

66967189 is a deficient number, since it is larger than the sum of its proper divisors (1).

66967189 is an equidigital number, since it uses as much as digits as its factorization.

66967189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 66967189 is about 8183.3482756143. The cubic root of 66967189 is about 406.0884989926.

The spelling of 66967189 in words is "sixty-six million, nine hundred sixty-seven thousand, one hundred eighty-nine".