6721860250813 has 2 divisors, whose sum is σ = 6721860250814. Its totient is φ = 6721860250812.

The previous prime is 6721860250783. The next prime is 6721860250943. The reversal of 6721860250813 is 3180520681276.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4885678067449 + 1836182183364 = 2210357^2 + 1355058^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6721860250813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721860250213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360930125406 + 3360930125407.

It is an arithmetic number, because the mean of its divisors is an integer number (3360930125407).

Almost surely, 2^{6721860250813} is an apocalyptic number.

It is an amenable number.

6721860250813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721860250813 is an equidigital number, since it uses as much as digits as its factorization.

6721860250813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 6721860250813 in words is "six trillion, seven hundred twenty-one billion, eight hundred sixty million, two hundred fifty thousand, eight hundred thirteen".