16663442 has 8 divisors (see below), whose sum is σ = 25122636. Its totient is φ = 8289232.

The previous prime is 16663441. The next prime is 16663453. The reversal of 16663442 is 24436661.

It can be written as a sum of positive squares in 2 ways, for example, as 16072081 + 591361 = 4009^2 + 769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 16663399 and 16663408.

It is not an unprimeable number, because it can be changed into a prime (16663441) 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, 20753 + ... + 21540.

Almost surely, 2^16663442 is an apocalyptic number.

16663442 is a deficient number, since it is larger than the sum of its proper divisors (8459194).

16663442 is a wasteful number, since it uses less digits than its factorization.

16663442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42492.

The product of its digits is 20736, while the sum is 32.

The square root of 16663442 is about 4082.0879461374. The cubic root of 16663442 is about 255.4200024521.

The spelling of 16663442 in words is "sixteen million, six hundred sixty-three thousand, four hundred forty-two".