16687005205 has 8 divisors (see below), whose sum is σ = 21564745272. Its totient is φ = 12322711488.

The previous prime is 16687005191. The next prime is 16687005233. The reversal of 16687005205 is 50250078661.

It can be written as a sum of positive squares in 4 ways, for example, as 2900253316 + 13786751889 = 53854^2 + 117417^2 .

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 16687005205 - 2⁷ = 16687005077 is a prime.

It is a super-2 number, since 2×16687005205² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128361514 + ... + 128361643.

It is an arithmetic number, because the mean of its divisors is an integer number (2695593159).

Almost surely, 2^16687005205 is an apocalyptic number.

It is an amenable number.

16687005205 is a deficient number, since it is larger than the sum of its proper divisors (4877740067).

16687005205 is a wasteful number, since it uses less digits than its factorization.

16687005205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256723175.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 16687005205 in words is "sixteen billion, six hundred eighty-seven million, five thousand, two hundred five".