66985229 has 2 divisors, whose sum is σ = 66985230. Its totient is φ = 66985228.

The previous prime is 66985213. The next prime is 66985249. The reversal of 66985229 is 92258966.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46717225 + 20268004 = 6835^2 + 4502^2 .

It is a cyclic number.

It is not a de Polignac number, because 66985229 - 2⁴ = 66985213 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 (66985249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33492614 + 33492615.

It is an arithmetic number, because the mean of its divisors is an integer number (33492615).

Almost surely, 2^66985229 is an apocalyptic number.

It is an amenable number.

66985229 is a deficient number, since it is larger than the sum of its proper divisors (1).

66985229 is an equidigital number, since it uses as much as digits as its factorization.

66985229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 47.

The square root of 66985229 is about 8184.4504397058. The cubic root of 66985229 is about 406.1249605240.

The spelling of 66985229 in words is "sixty-six million, nine hundred eighty-five thousand, two hundred twenty-nine".