16687158793 has 4 divisors (see below), whose sum is σ = 17094162708. Its totient is φ = 16280154880.

The previous prime is 16687158779. The next prime is 16687158797. The reversal of 16687158793 is 39785178661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1927824649 + 14759334144 = 43907^2 + 121488^2 .

It is a cyclic number.

It is not a de Polignac number, because 16687158793 - 2⁹ = 16687158281 is a prime.

It is a super-2 number, since 2×16687158793² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16687158797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203501896 + ... + 203501977.

It is an arithmetic number, because the mean of its divisors is an integer number (4273540677).

Almost surely, 2^16687158793 is an apocalyptic number.

It is an amenable number.

16687158793 is a deficient number, since it is larger than the sum of its proper divisors (407003915).

16687158793 is an equidigital number, since it uses as much as digits as its factorization.

16687158793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407003914.

The product of its digits is 15240960, while the sum is 61.

The spelling of 16687158793 in words is "sixteen billion, six hundred eighty-seven million, one hundred fifty-eight thousand, seven hundred ninety-three".