16556516 has 6 divisors (see below), whose sum is σ = 28973910. Its totient is φ = 8278256.

The previous prime is 16556513. The next prime is 16556531. The reversal of 16556516 is 61565561.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 556516 = 4000^2 + 746^2 .

It is not an unprimeable number, because it can be changed into a prime (16556513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069561 + ... + 2069568.

It is an arithmetic number, because the mean of its divisors is an integer number (4828985).

Almost surely, 2^16556516 is an apocalyptic number.

It is an amenable number.

16556516 is a deficient number, since it is larger than the sum of its proper divisors (12417394).

16556516 is a wasteful number, since it uses less digits than its factorization.

16556516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139133 (or 4139131 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 16556516 is about 4068.9698942116. The cubic root of 16556516 is about 254.8725032253.

It can be divided in two parts, 16 and 556516, that multiplied together give a square (8904256 = 2984²).

The spelling of 16556516 in words is "sixteen million, five hundred fifty-six thousand, five hundred sixteen".