1608449685687 has 24 divisors (see below), whose sum is σ = 2594700732624. Its totient is φ = 989815189248.

The previous prime is 1608449685679. The next prime is 1608449685707. The reversal of 1608449685687 is 7865869448061.

1608449685687 is a `hidden beast` number, since 1 + 6 + 0 + 8 + 4 + 496 + 8 + 56 + 87 = 666.

It is not a de Polignac number, because 1608449685687 - 2³ = 1608449685679 is a prime.

It is a super-2 number, since 2×1608449685687² (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 (1608449685607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254578938 + ... + 254585255.

It is an arithmetic number, because the mean of its divisors is an integer number (108112530526).

Almost surely, 2^{1608449685687} is an apocalyptic number.

1608449685687 is a deficient number, since it is larger than the sum of its proper divisors (986251046937).

1608449685687 is an equidigital number, since it uses as much as digits as its factorization.

1608449685687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509164221 (or 509164209 counting only the distinct ones).

The product of its (nonzero) digits is 557383680, while the sum is 72.

The spelling of 1608449685687 in words is "one trillion, six hundred eight billion, four hundred forty-nine million, six hundred eighty-five thousand, six hundred eighty-seven".