16985638619 has 4 divisors (see below), whose sum is σ = 17001180096. Its totient is φ = 16970097144.

The previous prime is 16985638597. The next prime is 16985638643. The reversal of 16985638619 is 91683658961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91683658961 = 34603 ⋅2649587.

It is a cyclic number.

It is not a de Polignac number, because 16985638619 - 2⁸ = 16985638363 is a prime.

It is a super-2 number, since 2×16985638619² (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 (16985638919) 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, 7769099 + ... + 7771284.

It is an arithmetic number, because the mean of its divisors is an integer number (4250295024).

Almost surely, 2^16985638619 is an apocalyptic number.

16985638619 is a deficient number, since it is larger than the sum of its proper divisors (15541477).

16985638619 is a wasteful number, since it uses less digits than its factorization.

16985638619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15541476.

The product of its digits is 16796160, while the sum is 62.

The spelling of 16985638619 in words is "sixteen billion, nine hundred eighty-five million, six hundred thirty-eight thousand, six hundred nineteen".