1220781383867 has 2 divisors, whose sum is σ = 1220781383868. Its totient is φ = 1220781383866.

The previous prime is 1220781383813. The next prime is 1220781383891. The reversal of 1220781383867 is 7683831870221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220781383867 - 2³⁶ = 1152061907131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220781343867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610390691933 + 610390691934.

It is an arithmetic number, because the mean of its divisors is an integer number (610390691934).

Almost surely, 2^{1220781383867} is an apocalyptic number.

1220781383867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220781383867 is an equidigital number, since it uses as much as digits as its factorization.

1220781383867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 1220781383867 in words is "one trillion, two hundred twenty billion, seven hundred eighty-one million, three hundred eighty-three thousand, eight hundred sixty-seven".