6553388209 has 3 divisors (see below), whose sum is σ = 6553469163. Its totient is φ = 6553307256.

The previous prime is 6553388197. The next prime is 6553388227. The reversal of 6553388209 is 9028833556.

The square root of 6553388209 is 80953.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 1379751025 + 5173637184 = 37145^2 + 71928^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6553388209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6553388239) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 40477 + ... + 121429.

It is an arithmetic number, because the mean of its divisors is an integer number (2184489721).

Almost surely, 2^6553388209 is an apocalyptic number.

6553388209 is the 80953-rd square number.

6553388209 is the 40477-th centered octagonal number.

It is an amenable number.

6553388209 is a deficient number, since it is larger than the sum of its proper divisors (80954).

6553388209 is an frugal number, since it uses more digits than its factorization.

6553388209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161906 (or 80953 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The cubic root of 6553388209 is about 1871.3511933640.

Multiplying 6553388209 by its sum of digits (49), we get a square (321116022241 = 566671²).

The spelling of 6553388209 in words is "six billion, five hundred fifty-three million, three hundred eighty-eight thousand, two hundred nine".