66442566439 has 16 divisors (see below), whose sum is σ = 70924583680. Its totient is φ = 62059711680.

The previous prime is 66442566427. The next prime is 66442566481. The reversal of 66442566439 is 93466524466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66442566439 is a prime.

It is a super-2 number, since 2×66442566439² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66442566439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66442566419) 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 in 15 ways as a sum of consecutive naturals, for example, 4412854 + ... + 4427884.

It is an arithmetic number, because the mean of its divisors is an integer number (4432786480).

Almost surely, 2^66442566439 is an apocalyptic number.

66442566439 is a deficient number, since it is larger than the sum of its proper divisors (4482017241).

66442566439 is a wasteful number, since it uses less digits than its factorization.

66442566439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18310.

The product of its digits is 22394880, while the sum is 55.

The spelling of 66442566439 in words is "sixty-six billion, four hundred forty-two million, five hundred sixty-six thousand, four hundred thirty-nine".