16155556 has 12 divisors (see below), whose sum is σ = 28552860. Its totient is φ = 7997600.

The previous prime is 16155551. The next prime is 16155563. The reversal of 16155556 is 65555161.

16155556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9734400 + 6421156 = 3120^2 + 2534^2 .

It is a super-4 number, since 4×16155556⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (16155551) 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, 19591 + ... + 20398.

It is an arithmetic number, because the mean of its divisors is an integer number (2379405).

Almost surely, 2^16155556 is an apocalyptic number.

It is an amenable number.

16155556 is a deficient number, since it is larger than the sum of its proper divisors (12397304).

16155556 is a wasteful number, since it uses less digits than its factorization.

16155556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40094 (or 40092 counting only the distinct ones).

The product of its digits is 22500, while the sum is 34.

The square root of 16155556 is about 4019.3974672829. The cubic root of 16155556 is about 252.7981955554.

The spelling of 16155556 in words is "sixteen million, one hundred fifty-five thousand, five hundred fifty-six".