16918570513 has 4 divisors (see below), whose sum is σ = 18219999028. Its totient is φ = 15617142000.

The previous prime is 16918570511. The next prime is 16918570523. The reversal of 16918570513 is 31507581961.

16918570513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31507581961 = 6997 ⋅4503013.

It can be written as a sum of positive squares in 2 ways, for example, as 9760056849 + 7158513664 = 98793^2 + 84608^2 .

It is a cyclic number.

It is not a de Polignac number, because 16918570513 - 2¹ = 16918570511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16918570511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650714238 + ... + 650714263.

It is an arithmetic number, because the mean of its divisors is an integer number (4554999757).

Almost surely, 2^16918570513 is an apocalyptic number.

16918570513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16918570513 is a deficient number, since it is larger than the sum of its proper divisors (1301428515).

16918570513 is a wasteful number, since it uses less digits than its factorization.

16918570513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301428514.

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 16918570513 in words is "sixteen billion, nine hundred eighteen million, five hundred seventy thousand, five hundred thirteen".