1320208203869 has 2 divisors, whose sum is σ = 1320208203870. Its totient is φ = 1320208203868.

The previous prime is 1320208203851. The next prime is 1320208203929. The reversal of 1320208203869 is 9683028020231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098174051844 + 222034152025 = 1047938^2 + 471205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320208203869 is a prime.

It is a super-2 number, since 2×1320208203869² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320208203269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660104101934 + 660104101935.

It is an arithmetic number, because the mean of its divisors is an integer number (660104101935).

Almost surely, 2^{1320208203869} is an apocalyptic number.

It is an amenable number.

1320208203869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320208203869 is an equidigital number, since it uses as much as digits as its factorization.

1320208203869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 1320208203869 in words is "one trillion, three hundred twenty billion, two hundred eight million, two hundred three thousand, eight hundred sixty-nine".