12718821645853 has 2 divisors, whose sum is σ = 12718821645854. Its totient is φ = 12718821645852.

The previous prime is 12718821645841. The next prime is 12718821645869. The reversal of 12718821645853 is 35854612881721.

12718821645853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12289918467204 + 428903178649 = 3505698^2 + 654907^2 .

It is a cyclic number.

It is not a de Polignac number, because 12718821645853 - 2³⁷ = 12581382692381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12718821645791 and 12718821645800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12718821645823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6359410822926 + 6359410822927.

It is an arithmetic number, because the mean of its divisors is an integer number (6359410822927).

Almost surely, 2^{12718821645853} is an apocalyptic number.

It is an amenable number.

12718821645853 is a deficient number, since it is larger than the sum of its proper divisors (1).

12718821645853 is an equidigital number, since it uses as much as digits as its factorization.

12718821645853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25804800, while the sum is 61.

The spelling of 12718821645853 in words is "twelve trillion, seven hundred eighteen billion, eight hundred twenty-one million, six hundred forty-five thousand, eight hundred fifty-three".