66144241 has 2 divisors, whose sum is σ = 66144242. Its totient is φ = 66144240.

The previous prime is 66144233. The next prime is 66144289. The reversal of 66144241 is 14244166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65950641 + 193600 = 8121^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 66144241 - 2³ = 66144233 is a prime.

It is not a weakly prime, because it can be changed into another prime (66144541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33072120 + 33072121.

It is an arithmetic number, because the mean of its divisors is an integer number (33072121).

Almost surely, 2^66144241 is an apocalyptic number.

It is an amenable number.

66144241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66144241 is an equidigital number, since it uses as much as digits as its factorization.

66144241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 66144241 is about 8132.9109794710. The cubic root of 66144241 is about 404.4181881081.

The spelling of 66144241 in words is "sixty-six million, one hundred forty-four thousand, two hundred forty-one".