1686671855 has 16 divisors (see below), whose sum is σ = 2217500064. Its totient is φ = 1221396480.

The previous prime is 1686671843. The next prime is 1686671867. The reversal of 1686671855 is 5581766861.

It is an interprime number because it is at equal distance from previous prime (1686671843) and next prime (1686671867).

It is not a de Polignac number, because 1686671855 - 2¹⁶ = 1686606319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1686671797 and 1686671806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52994 + ... + 78623.

It is an arithmetic number, because the mean of its divisors is an integer number (138593754).

Almost surely, 2^1686671855 is an apocalyptic number.

1686671855 is a deficient number, since it is larger than the sum of its proper divisors (530828209).

1686671855 is a wasteful number, since it uses less digits than its factorization.

1686671855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131866.

The product of its digits is 2419200, while the sum is 53.

The square root of 1686671855 is about 41069.1107159627. The cubic root of 1686671855 is about 1190.3560018131.

The spelling of 1686671855 in words is "one billion, six hundred eighty-six million, six hundred seventy-one thousand, eight hundred fifty-five".