16655565 has 24 divisors (see below), whose sum is σ = 27871200. Its totient is φ = 8492704.

The previous prime is 16655543. The next prime is 16655567. The reversal of 16655565 is 56555661.

It is not a de Polignac number, because 16655565 - 2¹² = 16651469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16655567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6886 + ... + 8984.

It is an arithmetic number, because the mean of its divisors is an integer number (1161300).

Almost surely, 2^16655565 is an apocalyptic number.

16655565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16655565 is a deficient number, since it is larger than the sum of its proper divisors (11215635).

16655565 is a wasteful number, since it uses less digits than its factorization.

16655565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153 (or 2130 counting only the distinct ones).

The product of its digits is 135000, while the sum is 39.

The square root of 16655565 is about 4081.1230072126. The cubic root of 16655565 is about 255.3797494546.

It can be divided in two parts, 1 and 6655565, that added together give a palindrome (6655566).

The spelling of 16655565 in words is "sixteen million, six hundred fifty-five thousand, five hundred sixty-five".