66445187 has 2 divisors, whose sum is σ = 66445188. Its totient is φ = 66445186.

The previous prime is 66445139. The next prime is 66445213. The reversal of 66445187 is 78154466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66445187 - 2⁶ = 66445123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66445117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33222593 + 33222594.

It is an arithmetic number, because the mean of its divisors is an integer number (33222594).

Almost surely, 2^66445187 is an apocalyptic number.

66445187 is a deficient number, since it is larger than the sum of its proper divisors (1).

66445187 is an equidigital number, since it uses as much as digits as its factorization.

66445187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 66445187 is about 8151.3917216632. The cubic root of 66445187 is about 405.0306068420.

The spelling of 66445187 in words is "sixty-six million, four hundred forty-five thousand, one hundred eighty-seven".