16655557 has 4 divisors (see below), whose sum is σ = 16664076. Its totient is φ = 16647040.

The previous prime is 16655543. The next prime is 16655567. The reversal of 16655557 is 75555661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16532356 + 123201 = 4066^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 16655557 - 2¹¹ = 16653509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16655537) 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 in 3 ways as a sum of consecutive naturals, for example, 303 + ... + 5779.

It is an arithmetic number, because the mean of its divisors is an integer number (4166019).

Almost surely, 2^16655557 is an apocalyptic number.

It is an amenable number.

16655557 is a deficient number, since it is larger than the sum of its proper divisors (8519).

16655557 is an equidigital number, since it uses as much as digits as its factorization.

16655557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518.

The product of its digits is 157500, while the sum is 40.

The square root of 16655557 is about 4081.1220270901. The cubic root of 16655557 is about 255.3797085666.

The spelling of 16655557 in words is "sixteen million, six hundred fifty-five thousand, five hundred fifty-seven".