16687871667 has 18 divisors (see below), whose sum is σ = 25000487148. Its totient is φ = 11123905284.

The previous prime is 16687871647. The next prime is 16687871693. The reversal of 16687871667 is 76617878661.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 16687871667 - 2¹⁶ = 16687806131 is a prime.

It is a super-2 number, since 2×16687871667² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16687871647) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2009598 + ... + 2017884.

Almost surely, 2^16687871667 is an apocalyptic number.

16687871667 is a deficient number, since it is larger than the sum of its proper divisors (8312615481).

16687871667 is an frugal number, since it uses more digits than its factorization.

16687871667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16589 (or 8290 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 16687871667 in words is "sixteen billion, six hundred eighty-seven million, eight hundred seventy-one thousand, six hundred sixty-seven".