16556123 has 2 divisors, whose sum is σ = 16556124. Its totient is φ = 16556122.

The previous prime is 16556107. The next prime is 16556149. The reversal of 16556123 is 32165561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16556123 - 2⁴ = 16556107 is a prime.

It is a super-2 number, since 2×16556123² = 548210417582258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16556153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278061 + 8278062.

It is an arithmetic number, because the mean of its divisors is an integer number (8278062).

Almost surely, 2^16556123 is an apocalyptic number.

16556123 is a deficient number, since it is larger than the sum of its proper divisors (1).

16556123 is an equidigital number, since it uses as much as digits as its factorization.

16556123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 29.

The square root of 16556123 is about 4068.9216016040. The cubic root of 16556123 is about 254.8704865835.

The spelling of 16556123 in words is "sixteen million, five hundred fifty-six thousand, one hundred twenty-three".