16656408 has 64 divisors (see below), whose sum is σ = 47088000. Its totient is φ = 5453856.

The previous prime is 16656389. The next prime is 16656421. The reversal of 16656408 is 80465661.

16656408 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 640 + 8 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12091 + ... + 13397.

It is an arithmetic number, because the mean of its divisors is an integer number (735750).

Almost surely, 2^16656408 is an apocalyptic number.

16656408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16656408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23544000).

16656408 is an abundant number, since it is smaller than the sum of its proper divisors (30431592).

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

16656408 is a wasteful number, since it uses less digits than its factorization.

16656408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381 (or 1371 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 16656408 is about 4081.2262863017. The cubic root of 16656408 is about 255.3840579544.

The spelling of 16656408 in words is "sixteen million, six hundred fifty-six thousand, four hundred eight".