66746887913 has 2 divisors, whose sum is σ = 66746887914. Its totient is φ = 66746887912.

The previous prime is 66746887871. The next prime is 66746887939. The reversal of 66746887913 is 31978864766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62213828329 + 4533059584 = 249427^2 + 67328^2 .

It is a cyclic number.

It is not a de Polignac number, because 66746887913 - 2¹⁶ = 66746822377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66746887913.

It is not a weakly prime, because it can be changed into another prime (66746887973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33373443956 + 33373443957.

It is an arithmetic number, because the mean of its divisors is an integer number (33373443957).

Almost surely, 2^66746887913 is an apocalyptic number.

It is an amenable number.

66746887913 is a deficient number, since it is larger than the sum of its proper divisors (1).

66746887913 is an equidigital number, since it uses as much as digits as its factorization.

66746887913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 65.

The spelling of 66746887913 in words is "sixty-six billion, seven hundred forty-six million, eight hundred eighty-seven thousand, nine hundred thirteen".