16445556 has 18 divisors (see below), whose sum is σ = 41570802. Its totient is φ = 5481840.

The previous prime is 16445549. The next prime is 16445557. The reversal of 16445556 is 65554461.

16445556 is a `hidden beast` number, since 1 + 64 + 45 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 285156 = 4020^2 + 534^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 456821 = 16445556 / (1 + 6 + 4 + 4 + 5 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 16445556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16445557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 228375 + ... + 228446.

It is an arithmetic number, because the mean of its divisors is an integer number (2309489).

Almost surely, 2^16445556 is an apocalyptic number.

It is an amenable number.

16445556 is an abundant number, since it is smaller than the sum of its proper divisors (25125246).

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

16445556 is a wasteful number, since it uses less digits than its factorization.

16445556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456831 (or 456826 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 16445556 is about 4055.3120718386. The cubic root of 16445556 is about 254.3018504137.

The spelling of 16445556 in words is "sixteen million, four hundred forty-five thousand, five hundred fifty-six".