16641663 has 16 divisors (see below), whose sum is σ = 23462400. Its totient is φ = 10463040.

The previous prime is 16641649. The next prime is 16641697. The reversal of 16641663 is 36614661.

It is a de Polignac number, because none of the positive numbers 2^k-16641663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16641263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15498 + ... + 16536.

It is an arithmetic number, because the mean of its divisors is an integer number (1466400).

Almost surely, 2^16641663 is an apocalyptic number.

16641663 is a deficient number, since it is larger than the sum of its proper divisors (6820737).

16641663 is a wasteful number, since it uses less digits than its factorization.

16641663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342.

The product of its digits is 15552, while the sum is 33.

The square root of 16641663 is about 4079.4194439895. The cubic root of 16641663 is about 255.3086765626.

The spelling of 16641663 in words is "sixteen million, six hundred forty-one thousand, six hundred sixty-three".