66439357441 has 2 divisors, whose sum is σ = 66439357442. Its totient is φ = 66439357440.

The previous prime is 66439357427. The next prime is 66439357451. The reversal of 66439357441 is 14475393466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48127584400 + 18311773041 = 219380^2 + 135321^2 .

It is a cyclic number.

It is not a de Polignac number, because 66439357441 - 2⁵ = 66439357409 is a prime.

It is not a weakly prime, because it can be changed into another prime (66439357451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33219678720 + 33219678721.

It is an arithmetic number, because the mean of its divisors is an integer number (33219678721).

Almost surely, 2^66439357441 is an apocalyptic number.

It is an amenable number.

66439357441 is a deficient number, since it is larger than the sum of its proper divisors (1).

66439357441 is an equidigital number, since it uses as much as digits as its factorization.

66439357441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 52.

The spelling of 66439357441 in words is "sixty-six billion, four hundred thirty-nine million, three hundred fifty-seven thousand, four hundred forty-one".