1668502018273 has 2 divisors, whose sum is σ = 1668502018274. Its totient is φ = 1668502018272.

The previous prime is 1668502018247. The next prime is 1668502018277. The reversal of 1668502018273 is 3728102058661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1564658244769 + 103843773504 = 1250863^2 + 322248^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668502018273 - 2⁹ = 1668502017761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668502018277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834251009136 + 834251009137.

It is an arithmetic number, because the mean of its divisors is an integer number (834251009137).

Almost surely, 2^{1668502018273} is an apocalyptic number.

It is an amenable number.

1668502018273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668502018273 is an equidigital number, since it uses as much as digits as its factorization.

1668502018273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 1668502018273 in words is "one trillion, six hundred sixty-eight billion, five hundred two million, eighteen thousand, two hundred seventy-three".