16557223 has 2 divisors, whose sum is σ = 16557224. Its totient is φ = 16557222.

The previous prime is 16557199. The next prime is 16557239. The reversal of 16557223 is 32275561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16557223 - 2¹³ = 16549031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16557283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278611 + 8278612.

It is an arithmetic number, because the mean of its divisors is an integer number (8278612).

Almost surely, 2^16557223 is an apocalyptic number.

16557223 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557223 is an equidigital number, since it uses as much as digits as its factorization.

16557223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 31.

The square root of 16557223 is about 4069.0567703093. The cubic root of 16557223 is about 254.8761310476.

The spelling of 16557223 in words is "sixteen million, five hundred fifty-seven thousand, two hundred twenty-three".