66344725439 has 2 divisors, whose sum is σ = 66344725440. Its totient is φ = 66344725438.

The previous prime is 66344725411. The next prime is 66344725457. The reversal of 66344725439 is 93452744366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66344725439 - 2¹⁶ = 66344659903 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66344725409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33172362719 + 33172362720.

It is an arithmetic number, because the mean of its divisors is an integer number (33172362720).

Almost surely, 2^66344725439 is an apocalyptic number.

66344725439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66344725439 is an equidigital number, since it uses as much as digits as its factorization.

66344725439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 53.

It can be divided in two parts, 663447 and 25439, that added together give a palindrome (688886).

The spelling of 66344725439 in words is "sixty-six billion, three hundred forty-four million, seven hundred twenty-five thousand, four hundred thirty-nine".