16611220103 has 4 divisors (see below), whose sum is σ = 17333447088. Its totient is φ = 15888993120.

The previous prime is 16611220051. The next prime is 16611220139. The reversal of 16611220103 is 30102211661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30102211661 = 17 ⋅1770718333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16611220103 is a prime.

It is a super-2 number, since 2×16611220103² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 722226961 = 16611220103 / (1 + 6 + 6 + 1 + 1 + 2 + 2 + 0 + 1 + 0 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16611220603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361113458 + ... + 361113503.

It is an arithmetic number, because the mean of its divisors is an integer number (4333361772).

Almost surely, 2^16611220103 is an apocalyptic number.

16611220103 is a deficient number, since it is larger than the sum of its proper divisors (722226985).

16611220103 is an equidigital number, since it uses as much as digits as its factorization.

16611220103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722226984.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 16611220103 its reverse (30102211661), we get a palindrome (46713431764).

The spelling of 16611220103 in words is "sixteen billion, six hundred eleven million, two hundred twenty thousand, one hundred three".