1685168242553 has 2 divisors, whose sum is σ = 1685168242554. Its totient is φ = 1685168242552.

The previous prime is 1685168242523. The next prime is 1685168242591. The reversal of 1685168242553 is 3552428615861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1300505317609 + 384662924944 = 1140397^2 + 620212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685168242553 - 2²⁰ = 1685167193977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1685168242523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842584121276 + 842584121277.

It is an arithmetic number, because the mean of its divisors is an integer number (842584121277).

Almost surely, 2^{1685168242553} is an apocalyptic number.

It is an amenable number.

1685168242553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685168242553 is an equidigital number, since it uses as much as digits as its factorization.

1685168242553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824000, while the sum is 56.

The spelling of 1685168242553 in words is "one trillion, six hundred eighty-five billion, one hundred sixty-eight million, two hundred forty-two thousand, five hundred fifty-three".