1363534640581 has 2 divisors, whose sum is σ = 1363534640582. Its totient is φ = 1363534640580.

The previous prime is 1363534640513. The next prime is 1363534640599. The reversal of 1363534640581 is 1850464353631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190370463681 + 173164176900 = 1091041^2 + 416130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1363534640581 - 2¹¹ = 1363534638533 is a prime.

It is a super-2 number, since 2×1363534640581² (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 (1363534440581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681767320290 + 681767320291.

It is an arithmetic number, because the mean of its divisors is an integer number (681767320291).

Almost surely, 2^{1363534640581} is an apocalyptic number.

It is an amenable number.

1363534640581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1363534640581 is an equidigital number, since it uses as much as digits as its factorization.

1363534640581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 1363534640581 in words is "one trillion, three hundred sixty-three billion, five hundred thirty-four million, six hundred forty thousand, five hundred eighty-one".