16563816 has 48 divisors (see below), whose sum is σ = 45052800. Its totient is φ = 5497632.

The previous prime is 16563793. The next prime is 16563829. The reversal of 16563816 is 61836561.

It is a happy number.

16563816 is a `hidden beast` number, since 1 + 6 + 5 + 638 + 16 = 666.

It is a super-3 number, since 3×16563816³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26985 + ... + 27591.

It is an arithmetic number, because the mean of its divisors is an integer number (938600).

Almost surely, 2^16563816 is an apocalyptic number.

It is an amenable number.

16563816 is an abundant number, since it is smaller than the sum of its proper divisors (28488984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16563816 is a wasteful number, since it uses less digits than its factorization.

16563816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998 (or 991 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 16563816 is about 4069.8668282881. The cubic root of 16563816 is about 254.9099566744.

The spelling of 16563816 in words is "sixteen million, five hundred sixty-three thousand, eight hundred sixteen".