16557311111 has 4 divisors (see below), whose sum is σ = 18062521224. Its totient is φ = 15052101000.

The previous prime is 16557311083. The next prime is 16557311153. The reversal of 16557311111 is 11111375561.

16557311111 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16557311111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557311611) 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, 752605040 + ... + 752605061.

It is an arithmetic number, because the mean of its divisors is an integer number (4515630306).

Almost surely, 2^16557311111 is an apocalyptic number.

16557311111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16557311111 is a deficient number, since it is larger than the sum of its proper divisors (1505210113).

16557311111 is a wasteful number, since it uses less digits than its factorization.

16557311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505210112.

The product of its digits is 3150, while the sum is 32.

Adding to 16557311111 its reverse (11111375561), we get a palindrome (27668686672).

The spelling of 16557311111 in words is "sixteen billion, five hundred fifty-seven million, three hundred eleven thousand, one hundred eleven".