66442511489 has 2 divisors, whose sum is σ = 66442511490. Its totient is φ = 66442511488.

The previous prime is 66442511483. The next prime is 66442511537. The reversal of 66442511489 is 98411524466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59601898225 + 6840613264 = 244135^2 + 82708^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66442511489 is a prime.

It is not a weakly prime, because it can be changed into another prime (66442511483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33221255744 + 33221255745.

It is an arithmetic number, because the mean of its divisors is an integer number (33221255745).

Almost surely, 2^66442511489 is an apocalyptic number.

It is an amenable number.

66442511489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66442511489 is an equidigital number, since it uses as much as digits as its factorization.

66442511489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 50.

The spelling of 66442511489 in words is "sixty-six billion, four hundred forty-two million, five hundred eleven thousand, four hundred eighty-nine".