6645347361 has 27 divisors (see below), whose sum is σ = 9951863961. Its totient is φ = 4272899904.

The previous prime is 6645347341. The next prime is 6645347369. The reversal of 6645347361 is 1637435466.

The square root of 6645347361 is 81519.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1695380625 + 4949966736 = 41175^2 + 70356^2 .

It is not a de Polignac number, because 6645347361 - 2⁹ = 6645346849 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6645347369) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7091685 + ... + 7092621.

Almost surely, 2^6645347361 is an apocalyptic number.

6645347361 is the 81519-th square number.

6645347361 is the 40760-th centered octagonal number.

It is an amenable number.

6645347361 is a deficient number, since it is larger than the sum of its proper divisors (3306516600).

6645347361 is an frugal number, since it uses more digits than its factorization.

6645347361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938 (or 969 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 45.

The cubic root of 6645347361 is about 1880.0636919157.

The spelling of 6645347361 in words is "six billion, six hundred forty-five million, three hundred forty-seven thousand, three hundred sixty-one".