1685834391797 has 2 divisors, whose sum is σ = 1685834391798. Its totient is φ = 1685834391796.

The previous prime is 1685834391757. The next prime is 1685834391907. The reversal of 1685834391797 is 7971934385861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1588845124036 + 96989267761 = 1260494^2 + 311431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685834391797 - 2⁶ = 1685834391733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1685834391797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685834391727) 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, 842917195898 + 842917195899.

It is an arithmetic number, because the mean of its divisors is an integer number (842917195899).

Almost surely, 2^{1685834391797} is an apocalyptic number.

It is an amenable number.

1685834391797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685834391797 is an equidigital number, since it uses as much as digits as its factorization.

1685834391797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 274337280, while the sum is 71.

The spelling of 1685834391797 in words is "one trillion, six hundred eighty-five billion, eight hundred thirty-four million, three hundred ninety-one thousand, seven hundred ninety-seven".