1685873863 has 2 divisors, whose sum is σ = 1685873864. Its totient is φ = 1685873862.

The previous prime is 1685873801. The next prime is 1685873887. The reversal of 1685873863 is 3683785861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685873863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685873263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842936931 + 842936932.

It is an arithmetic number, because the mean of its divisors is an integer number (842936932).

Almost surely, 2^1685873863 is an apocalyptic number.

1685873863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685873863 is an equidigital number, since it uses as much as digits as its factorization.

1685873863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 55.

The square root of 1685873863 is about 41059.3943330878. The cubic root of 1685873863 is about 1190.1682465785.

The spelling of 1685873863 in words is "one billion, six hundred eighty-five million, eight hundred seventy-three thousand, eight hundred sixty-three".