16813838617 has 4 divisors (see below), whose sum is σ = 16814539060. Its totient is φ = 16813138176.

The previous prime is 16813838597. The next prime is 16813838623. The reversal of 16813838617 is 71683831861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71683831861 = 163781 ⋅437681.

It can be written as a sum of positive squares in 2 ways, for example, as 3649488921 + 13164349696 = 60411^2 + 114736^2 .

It is a cyclic number.

It is not a de Polignac number, because 16813838617 - 2¹¹ = 16813836569 is a prime.

It is a super-3 number, since 3×16813838617³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16813838417) 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, 312888 + ... + 362665.

It is an arithmetic number, because the mean of its divisors is an integer number (4203634765).

Almost surely, 2^16813838617 is an apocalyptic number.

It is an amenable number.

16813838617 is a deficient number, since it is larger than the sum of its proper divisors (700443).

16813838617 is an equidigital number, since it uses as much as digits as its factorization.

16813838617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700442.

The product of its digits is 1161216, while the sum is 52.

It can be divided in two parts, 1681383 and 8617, that added together give a square (1690000 = 1300²).

The spelling of 16813838617 in words is "sixteen billion, eight hundred thirteen million, eight hundred thirty-eight thousand, six hundred seventeen".