16868703517 has 4 divisors (see below), whose sum is σ = 16961900956. Its totient is φ = 16775506080.

The previous prime is 16868703497. The next prime is 16868703583. The reversal of 16868703517 is 71530786861.

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 7929190116 + 8939513401 = 89046^2 + 94549^2 .

It is a cyclic number.

It is not a de Polignac number, because 16868703517 - 2²³ = 16860314909 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 (16868703587) 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, 46598448 + ... + 46598809.

It is an arithmetic number, because the mean of its divisors is an integer number (4240475239).

Almost surely, 2^16868703517 is an apocalyptic number.

It is an amenable number.

16868703517 is a deficient number, since it is larger than the sum of its proper divisors (93197439).

16868703517 is an equidigital number, since it uses as much as digits as its factorization.

16868703517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93197438.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 16868703517 in words is "sixteen billion, eight hundred sixty-eight million, seven hundred three thousand, five hundred seventeen".