6863649253 has 4 divisors (see below), whose sum is σ = 6864307308. Its totient is φ = 6862991200.

The previous prime is 6863649217. The next prime is 6863649257. The reversal of 6863649253 is 3529463686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3641156964 + 3222492289 = 60342^2 + 56767^2 .

It is a cyclic number.

It is not a de Polignac number, because 6863649253 - 2⁹ = 6863648741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6863649253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6863649257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313126 + ... + 334327.

It is an arithmetic number, because the mean of its divisors is an integer number (1716076827).

Almost surely, 2^6863649253 is an apocalyptic number.

It is an amenable number.

6863649253 is a deficient number, since it is larger than the sum of its proper divisors (658055).

6863649253 is a wasteful number, since it uses less digits than its factorization.

6863649253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658054.

The product of its digits is 5598720, while the sum is 52.

The square root of 6863649253 is about 82847.1439036977. The cubic root of 6863649253 is about 1900.4291969459.

The spelling of 6863649253 in words is "six billion, eight hundred sixty-three million, six hundred forty-nine thousand, two hundred fifty-three".