16557228911 has 2 divisors, whose sum is σ = 16557228912. Its totient is φ = 16557228910.

The previous prime is 16557228889. The next prime is 16557228913. The reversal of 16557228911 is 11982275561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16557228911 is a prime.

It is a super-2 number, since 2×16557228911² (a number of 21 digits) contains 22 as substring.

Together with 16557228913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16557228913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278614455 + 8278614456.

It is an arithmetic number, because the mean of its divisors is an integer number (8278614456).

Almost surely, 2^16557228911 is an apocalyptic number.

16557228911 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557228911 is an equidigital number, since it uses as much as digits as its factorization.

16557228911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 47.

The spelling of 16557228911 in words is "sixteen billion, five hundred fifty-seven million, two hundred twenty-eight thousand, nine hundred eleven".