1685161663 has 2 divisors, whose sum is σ = 1685161664. Its totient is φ = 1685161662.

The previous prime is 1685161613. The next prime is 1685161693. The reversal of 1685161663 is 3661615861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1685161663 - 2⁹ = 1685161151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685161613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842580831 + 842580832.

It is an arithmetic number, because the mean of its divisors is an integer number (842580832).

Almost surely, 2^1685161663 is an apocalyptic number.

1685161663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685161663 is an equidigital number, since it uses as much as digits as its factorization.

1685161663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 1685161663 is about 41050.7206148686. The cubic root of 1685161663 is about 1190.0006268386. Note that the first 3 decimals are identical.

The spelling of 1685161663 in words is "one billion, six hundred eighty-five million, one hundred sixty-one thousand, six hundred sixty-three".