16556416 has 16 divisors (see below), whose sum is σ = 32983740. Its totient is φ = 8278144.

The previous prime is 16556381. The next prime is 16556443. The reversal of 16556416 is 61465561.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×16556416² = 548229821530112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64546 + ... + 64801.

Almost surely, 2^16556416 is an apocalyptic number.

16556416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16556416 is a deficient number, since it is larger than the sum of its proper divisors (16427324).

16556416 is an equidigital number, since it uses as much as digits as its factorization.

16556416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129361 (or 129349 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 16556416 is about 4068.9576060706. The cubic root of 16556416 is about 254.8719900879.

The spelling of 16556416 in words is "sixteen million, five hundred fifty-six thousand, four hundred sixteen".