1665263406413 has 2 divisors, whose sum is σ = 1665263406414. Its totient is φ = 1665263406412.

The previous prime is 1665263406343. The next prime is 1665263406497. The reversal of 1665263406413 is 3146043625661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1432706059849 + 232557346564 = 1196957^2 + 482242^2 .

It is an emirp because it is prime and its reverse (3146043625661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1665263406413 - 2²⁶ = 1665196297549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665263406613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832631703206 + 832631703207.

It is an arithmetic number, because the mean of its divisors is an integer number (832631703207).

Almost surely, 2^{1665263406413} is an apocalyptic number.

It is an amenable number.

1665263406413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665263406413 is an equidigital number, since it uses as much as digits as its factorization.

1665263406413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 1665263406413 in words is "one trillion, six hundred sixty-five billion, two hundred sixty-three million, four hundred six thousand, four hundred thirteen".