1685389217423 has 2 divisors, whose sum is σ = 1685389217424. Its totient is φ = 1685389217422.

The previous prime is 1685389217389. The next prime is 1685389217431. The reversal of 1685389217423 is 3247129835861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1685389217423 - 2⁶ = 1685389217359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685389210423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842694608711 + 842694608712.

It is an arithmetic number, because the mean of its divisors is an integer number (842694608712).

Almost surely, 2^{1685389217423} is an apocalyptic number.

1685389217423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685389217423 is an equidigital number, since it uses as much as digits as its factorization.

1685389217423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 59.

The spelling of 1685389217423 in words is "one trillion, six hundred eighty-five billion, three hundred eighty-nine million, two hundred seventeen thousand, four hundred twenty-three".