66868696439 has 2 divisors, whose sum is σ = 66868696440. Its totient is φ = 66868696438.

The previous prime is 66868696429. The next prime is 66868696487. The reversal of 66868696439 is 93469686866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66868696439 is a prime.

It is a super-2 number, since 2×66868696439² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66868696429) 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, 33434348219 + 33434348220.

It is an arithmetic number, because the mean of its divisors is an integer number (33434348220).

Almost surely, 2^66868696439 is an apocalyptic number.

66868696439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66868696439 is an equidigital number, since it uses as much as digits as its factorization.

66868696439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483729408, while the sum is 71.

The spelling of 66868696439 in words is "sixty-six billion, eight hundred sixty-eight million, six hundred ninety-six thousand, four hundred thirty-nine".