66967489 has 2 divisors, whose sum is σ = 66967490. Its totient is φ = 66967488.

The previous prime is 66967477. The next prime is 66967507. The reversal of 66967489 is 98476966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62536464 + 4431025 = 7908^2 + 2105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66967489 is a prime.

It is not a weakly prime, because it can be changed into another prime (66967429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33483744 + 33483745.

It is an arithmetic number, because the mean of its divisors is an integer number (33483745).

Almost surely, 2^66967489 is an apocalyptic number.

It is an amenable number.

66967489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66967489 is an equidigital number, since it uses as much as digits as its factorization.

66967489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The square root of 66967489 is about 8183.3666054992. The cubic root of 66967489 is about 406.0891053909.

The spelling of 66967489 in words is "sixty-six million, nine hundred sixty-seven thousand, four hundred eighty-nine".