16318663 has 4 divisors (see below), whose sum is σ = 17177560. Its totient is φ = 15459768.

The previous prime is 16318637. The next prime is 16318667. The reversal of 16318663 is 36681361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36681361 = 67 ⋅547483.

It is not a de Polignac number, because 16318663 - 2²¹ = 14221511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16318667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429420 + ... + 429457.

It is an arithmetic number, because the mean of its divisors is an integer number (4294390).

Almost surely, 2^16318663 is an apocalyptic number.

16318663 is a deficient number, since it is larger than the sum of its proper divisors (858897).

16318663 is an equidigital number, since it uses as much as digits as its factorization.

16318663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858896.

The product of its digits is 15552, while the sum is 34.

The square root of 16318663 is about 4039.6364935474. The cubic root of 16318663 is about 253.6461012677.

The spelling of 16318663 in words is "sixteen million, three hundred eighteen thousand, six hundred sixty-three".