1381361688673 has 2 divisors, whose sum is σ = 1381361688674. Its totient is φ = 1381361688672.

The previous prime is 1381361688593. The next prime is 1381361688697. The reversal of 1381361688673 is 3768861631831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1161861942609 + 219499746064 = 1077897^2 + 468508^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381361688673 - 2²⁹ = 1380824817761 is a prime.

It is a super-2 number, since 2×1381361688673² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1381361688173) 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, 690680844336 + 690680844337.

It is an arithmetic number, because the mean of its divisors is an integer number (690680844337).

Almost surely, 2^{1381361688673} is an apocalyptic number.

It is an amenable number.

1381361688673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381361688673 is an equidigital number, since it uses as much as digits as its factorization.

1381361688673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 61.

The spelling of 1381361688673 in words is "one trillion, three hundred eighty-one billion, three hundred sixty-one million, six hundred eighty-eight thousand, six hundred seventy-three".