16409663 has 4 divisors (see below), whose sum is σ = 16418160. Its totient is φ = 16401168.

The previous prime is 16409639. The next prime is 16409677. The reversal of 16409663 is 36690461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16409663 - 2⁶ = 16409599 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 (16409693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206 + ... + 5732.

It is an arithmetic number, because the mean of its divisors is an integer number (4104540).

Almost surely, 2^16409663 is an apocalyptic number.

16409663 is a deficient number, since it is larger than the sum of its proper divisors (8497).

16409663 is an equidigital number, since it uses as much as digits as its factorization.

16409663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 16409663 is about 4050.8842244626. The cubic root of 16409663 is about 254.1167081002.

The spelling of 16409663 in words is "sixteen million, four hundred nine thousand, six hundred sixty-three".