66387478373 has 2 divisors, whose sum is σ = 66387478374. Its totient is φ = 66387478372.

The previous prime is 66387478363. The next prime is 66387478393. The reversal of 66387478373 is 37387478366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58943585089 + 7443893284 = 242783^2 + 86278^2 .

It is a cyclic number.

It is not a de Polignac number, because 66387478373 - 2⁸ = 66387478117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66387478363) 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, 33193739186 + 33193739187.

It is an arithmetic number, because the mean of its divisors is an integer number (33193739187).

Almost surely, 2^66387478373 is an apocalyptic number.

It is an amenable number.

66387478373 is a deficient number, since it is larger than the sum of its proper divisors (1).

66387478373 is an equidigital number, since it uses as much as digits as its factorization.

66387478373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 85349376, while the sum is 62.

It can be divided in two parts, 663874 and 78373, that added together give a palindrome (742247).

The spelling of 66387478373 in words is "sixty-six billion, three hundred eighty-seven million, four hundred seventy-eight thousand, three hundred seventy-three".