16381663 has 4 divisors (see below), whose sum is σ = 16482328. Its totient is φ = 16281000.

The previous prime is 16381661. The next prime is 16381691. The reversal of 16381663 is 36618361.

It is a happy number.

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 16381663 - 2¹ = 16381661 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 (16381661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50088 + ... + 50413.

It is an arithmetic number, because the mean of its divisors is an integer number (4120582).

Almost surely, 2^16381663 is an apocalyptic number.

16381663 is a deficient number, since it is larger than the sum of its proper divisors (100665).

16381663 is a wasteful number, since it uses less digits than its factorization.

16381663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100664.

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

The square root of 16381663 is about 4047.4267133575. The cubic root of 16381663 is about 253.9720917112.

The spelling of 16381663 in words is "sixteen million, three hundred eighty-one thousand, six hundred sixty-three".