66734715125789 has 2 divisors, whose sum is σ = 66734715125790. Its totient is φ = 66734715125788.

The previous prime is 66734715125747. The next prime is 66734715125791. The reversal of 66734715125789 is 98752151743766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43207510390564 + 23527204735225 = 6573242^2 + 4850485^2 .

It is a cyclic number.

It is not a de Polignac number, because 66734715125789 - 2¹² = 66734715121693 is a prime.

It is a super-2 number, since 2×66734715125789² (a number of 28 digits) contains 22 as substring.

Together with 66734715125791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66734715125189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33367357562894 + 33367357562895.

It is an arithmetic number, because the mean of its divisors is an integer number (33367357562895).

Almost surely, 2^{66734715125789} is an apocalyptic number.

It is an amenable number.

66734715125789 is a deficient number, since it is larger than the sum of its proper divisors (1).

66734715125789 is an equidigital number, since it uses as much as digits as its factorization.

66734715125789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 533433600, while the sum is 71.

The spelling of 66734715125789 in words is "sixty-six trillion, seven hundred thirty-four billion, seven hundred fifteen million, one hundred twenty-five thousand, seven hundred eighty-nine".