66018149 has 2 divisors, whose sum is σ = 66018150. Its totient is φ = 66018148.

The previous prime is 66018131. The next prime is 66018163. The reversal of 66018149 is 94181066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41088100 + 24930049 = 6410^2 + 4993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66018149 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_3897143 and since 66018149 and 3897143 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66018949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33009074 + 33009075.

It is an arithmetic number, because the mean of its divisors is an integer number (33009075).

Almost surely, 2^66018149 is an apocalyptic number.

It is an amenable number.

66018149 is a deficient number, since it is larger than the sum of its proper divisors (1).

66018149 is an equidigital number, since it uses as much as digits as its factorization.

66018149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 66018149 is about 8125.1553215923. The cubic root of 66018149 is about 404.1610413265.

The spelling of 66018149 in words is "sixty-six million, eighteen thousand, one hundred forty-nine".