16686671655 has 8 divisors (see below), whose sum is σ = 26698674672. Its totient is φ = 8899558208.

The previous prime is 16686671641. The next prime is 16686671689. The reversal of 16686671655 is 55617668661.

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

It is a cyclic number.

It is not a de Polignac number, because 16686671655 - 2¹⁰ = 16686670631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16686671595 and 16686671604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556222374 + ... + 556222403.

It is an arithmetic number, because the mean of its divisors is an integer number (3337334334).

Almost surely, 2^16686671655 is an apocalyptic number.

16686671655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16686671655 is a deficient number, since it is larger than the sum of its proper divisors (10012003017).

16686671655 is a wasteful number, since it uses less digits than its factorization.

16686671655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112444785.

The product of its digits is 10886400, while the sum is 57.

The spelling of 16686671655 in words is "sixteen billion, six hundred eighty-six million, six hundred seventy-one thousand, six hundred fifty-five".