16613221567 has 4 divisors (see below), whose sum is σ = 16734486096. Its totient is φ = 16491957040.

The previous prime is 16613221549. The next prime is 16613221601. The reversal of 16613221567 is 76512231661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76512231661 = 37 ⋅2067898153.

It is a cyclic number.

It is not a de Polignac number, because 16613221567 - 2¹⁵ = 16613188799 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16613221507) 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, 60632059 + ... + 60632332.

It is an arithmetic number, because the mean of its divisors is an integer number (4183621524).

Almost surely, 2^16613221567 is an apocalyptic number.

16613221567 is a deficient number, since it is larger than the sum of its proper divisors (121264529).

16613221567 is a wasteful number, since it uses less digits than its factorization.

16613221567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121264528.

The product of its digits is 90720, while the sum is 40.

The spelling of 16613221567 in words is "sixteen billion, six hundred thirteen million, two hundred twenty-one thousand, five hundred sixty-seven".