4897718660221 has 2 divisors, whose sum is σ = 4897718660222. Its totient is φ = 4897718660220.

The previous prime is 4897718660207. The next prime is 4897718660269. The reversal of 4897718660221 is 1220668177984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3261596268121 + 1636122392100 = 1805989^2 + 1279110^2 .

It is a cyclic number.

It is not a de Polignac number, because 4897718660221 - 2¹⁷ = 4897718529149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4897718660221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4897718660201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2448859330110 + 2448859330111.

It is an arithmetic number, because the mean of its divisors is an integer number (2448859330111).

Almost surely, 2^{4897718660221} is an apocalyptic number.

It is an amenable number.

4897718660221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4897718660221 is an equidigital number, since it uses as much as digits as its factorization.

4897718660221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 4897718660221 in words is "four trillion, eight hundred ninety-seven billion, seven hundred eighteen million, six hundred sixty thousand, two hundred twenty-one".