2643865361 has 8 divisors (see below), whose sum is σ = 2712765384. Its totient is φ = 2575175680.

The previous prime is 2643865337. The next prime is 2643865373. The reversal of 2643865361 is 1635683462.

It is a happy number.

2643865361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 448380625 + 2195484736 = 21175^2 + 46856^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2643865361 - 2⁶ = 2643865297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2643865331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26960 + ... + 77553.

It is an arithmetic number, because the mean of its divisors is an integer number (339095673).

Almost surely, 2^2643865361 is an apocalyptic number.

It is an amenable number.

2643865361 is a deficient number, since it is larger than the sum of its proper divisors (68900023).

2643865361 is a wasteful number, since it uses less digits than its factorization.

2643865361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105171.

The product of its digits is 622080, while the sum is 44.

The square root of 2643865361 is about 51418.5312995227. The cubic root of 2643865361 is about 1382.7588443503.

The spelling of 2643865361 in words is "two billion, six hundred forty-three million, eight hundred sixty-five thousand, three hundred sixty-one".