16686703717 has 4 divisors (see below), whose sum is σ = 16874194860. Its totient is φ = 16499212576.

The previous prime is 16686703687. The next prime is 16686703723. The reversal of 16686703717 is 71730768661.

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 2405019681 + 14281684036 = 49041^2 + 119506^2 .

It is a cyclic number.

It is not a de Polignac number, because 16686703717 - 2²³ = 16678315109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16686703727) 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, 93745438 + ... + 93745615.

It is an arithmetic number, because the mean of its divisors is an integer number (4218548715).

Almost surely, 2^16686703717 is an apocalyptic number.

It is an amenable number.

16686703717 is a deficient number, since it is larger than the sum of its proper divisors (187491143).

16686703717 is an equidigital number, since it uses as much as digits as its factorization.

16686703717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187491142.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 16686703717 in words is "sixteen billion, six hundred eighty-six million, seven hundred three thousand, seven hundred seventeen".