6540686644203 has 8 divisors (see below), whose sum is σ = 9689906139600. Its totient is φ = 4360457762784.

The previous prime is 6540686644199. The next prime is 6540686644207. The reversal of 6540686644203 is 3024466860456.

6540686644203 is a `hidden beast` number, since 65 + 40 + 68 + 6 + 64 + 420 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (6540686644199) and next prime (6540686644207).

It is not a de Polignac number, because 6540686644203 - 2² = 6540686644199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6540686644203.

It is not an unprimeable number, because it can be changed into a prime (6540686644207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121123826718 + ... + 121123826771.

It is an arithmetic number, because the mean of its divisors is an integer number (1211238267450).

Almost surely, 2^{6540686644203} is an apocalyptic number.

6540686644203 is a deficient number, since it is larger than the sum of its proper divisors (3149219495397).

6540686644203 is a wasteful number, since it uses less digits than its factorization.

6540686644203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242247653498 (or 242247653492 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 54.

The spelling of 6540686644203 in words is "six trillion, five hundred forty billion, six hundred eighty-six million, six hundred forty-four thousand, two hundred three".