16663123 has 4 divisors (see below), whose sum is σ = 16701520. Its totient is φ = 16624728.

The previous prime is 16663121. The next prime is 16663159. The reversal of 16663123 is 32136661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16663123 - 2¹ = 16663121 is a prime.

It is a super-2 number, since 2×16663123² = 555319336226258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16663091 and 16663100.

It is not an unprimeable number, because it can be changed into a prime (16663121) 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 in 3 ways as a sum of consecutive naturals, for example, 18540 + ... + 19417.

It is an arithmetic number, because the mean of its divisors is an integer number (4175380).

Almost surely, 2^16663123 is an apocalyptic number.

16663123 is a deficient number, since it is larger than the sum of its proper divisors (38397).

16663123 is an equidigital number, since it uses as much as digits as its factorization.

16663123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38396.

The product of its digits is 3888, while the sum is 28.

The square root of 16663123 is about 4082.0488728088. The cubic root of 16663123 is about 255.4183725467.

Adding to 16663123 its reverse (32136661), we get a palindrome (48799784).

The spelling of 16663123 in words is "sixteen million, six hundred sixty-three thousand, one hundred twenty-three".