1220768820017 has 2 divisors, whose sum is σ = 1220768820018. Its totient is φ = 1220768820016.

The previous prime is 1220768819971. The next prime is 1220768820043. The reversal of 1220768820017 is 7100288670221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1088080558321 + 132688261696 = 1043111^2 + 364264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220768820017 - 2⁶ = 1220768819953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220768820017.

It is not a weakly prime, because it can be changed into another prime (1220768820517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610384410008 + 610384410009.

It is an arithmetic number, because the mean of its divisors is an integer number (610384410009).

Almost surely, 2^{1220768820017} is an apocalyptic number.

It is an amenable number.

1220768820017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220768820017 is an equidigital number, since it uses as much as digits as its factorization.

1220768820017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 44.

The spelling of 1220768820017 in words is "one trillion, two hundred twenty billion, seven hundred sixty-eight million, eight hundred twenty thousand, seventeen".