66439353439 has 2 divisors, whose sum is σ = 66439353440. Its totient is φ = 66439353438.

The previous prime is 66439353433. The next prime is 66439353521. The reversal of 66439353439 is 93435393466.

66439353439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66439353439 - 2¹⁵ = 66439320671 is a prime.

It is a super-2 number, since 2×66439353439² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66439353439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66439353433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33219676719 + 33219676720.

It is an arithmetic number, because the mean of its divisors is an integer number (33219676720).

Almost surely, 2^66439353439 is an apocalyptic number.

66439353439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66439353439 is an equidigital number, since it uses as much as digits as its factorization.

66439353439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 55.

The spelling of 66439353439 in words is "sixty-six billion, four hundred thirty-nine million, three hundred fifty-three thousand, four hundred thirty-nine".