66644160241 has 2 divisors, whose sum is σ = 66644160242. Its totient is φ = 66644160240.

The previous prime is 66644160199. The next prime is 66644160259. The reversal of 66644160241 is 14206144666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66618191025 + 25969216 = 258105^2 + 5096^2 .

It is a cyclic number.

It is not a de Polignac number, because 66644160241 - 2²³ = 66635771633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66644160194 and 66644160203.

It is not a weakly prime, because it can be changed into another prime (66644160941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33322080120 + 33322080121.

It is an arithmetic number, because the mean of its divisors is an integer number (33322080121).

Almost surely, 2^66644160241 is an apocalyptic number.

It is an amenable number.

66644160241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66644160241 is an equidigital number, since it uses as much as digits as its factorization.

66644160241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 66644160241 in words is "sixty-six billion, six hundred forty-four million, one hundred sixty thousand, two hundred forty-one".