66188347613 has 2 divisors, whose sum is σ = 66188347614. Its totient is φ = 66188347612.

The previous prime is 66188347609. The next prime is 66188347633. The reversal of 66188347613 is 31674388166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60310518724 + 5877828889 = 245582^2 + 76667^2 .

It is a cyclic number.

It is not a de Polignac number, because 66188347613 - 2² = 66188347609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66188347633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33094173806 + 33094173807.

It is an arithmetic number, because the mean of its divisors is an integer number (33094173807).

Almost surely, 2^66188347613 is an apocalyptic number.

It is an amenable number.

66188347613 is a deficient number, since it is larger than the sum of its proper divisors (1).

66188347613 is an equidigital number, since it uses as much as digits as its factorization.

66188347613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 53.

The spelling of 66188347613 in words is "sixty-six billion, one hundred eighty-eight million, three hundred forty-seven thousand, six hundred thirteen".