1685516671887 has 8 divisors (see below), whose sum is σ = 2254024274736. Its totient is φ = 1120343425152.

The previous prime is 1685516671859. The next prime is 1685516671913. The reversal of 1685516671887 is 7881766155861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1685516671887 - 2¹⁹ = 1685516147599 is a prime.

It is a super-2 number, since 2×1685516671887² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685516671087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 833587848 + ... + 833589869.

It is an arithmetic number, because the mean of its divisors is an integer number (281753034342).

Almost surely, 2^{1685516671887} is an apocalyptic number.

1685516671887 is a deficient number, since it is larger than the sum of its proper divisors (568507602849).

1685516671887 is a wasteful number, since it uses less digits than its factorization.

1685516671887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667178057.

The product of its digits is 135475200, while the sum is 69.

The spelling of 1685516671887 in words is "one trillion, six hundred eighty-five billion, five hundred sixteen million, six hundred seventy-one thousand, eight hundred eighty-seven".