16655489 has 2 divisors, whose sum is σ = 16655490. Its totient is φ = 16655488.

The previous prime is 16655477. The next prime is 16655537. The reversal of 16655489 is 98455661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 5798464 = 3295^2 + 2408^2 .

It is an emirp because it is prime and its reverse (98455661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16655489 is a prime.

It is not a weakly prime, because it can be changed into another prime (16655449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8327744 + 8327745.

It is an arithmetic number, because the mean of its divisors is an integer number (8327745).

Almost surely, 2^16655489 is an apocalyptic number.

It is an amenable number.

16655489 is a deficient number, since it is larger than the sum of its proper divisors (1).

16655489 is an equidigital number, since it uses as much as digits as its factorization.

16655489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 44.

The square root of 16655489 is about 4081.1136960394. The cubic root of 16655489 is about 255.3793610180.

It can be divided in two parts, 166 and 55489, that added together give a palindrome (55655).

The spelling of 16655489 in words is "sixteen million, six hundred fifty-five thousand, four hundred eighty-nine".