1363165681 has 2 divisors, whose sum is σ = 1363165682. Its totient is φ = 1363165680.

The previous prime is 1363165667. The next prime is 1363165703. The reversal of 1363165681 is 1865613631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1089594081 + 273571600 = 33009^2 + 16540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1363165681 - 2⁹ = 1363165169 is a prime.

It is a super-2 number, since 2×1363165681² = 3716441347712387522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1363165631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681582840 + 681582841.

It is an arithmetic number, because the mean of its divisors is an integer number (681582841).

Almost surely, 2^1363165681 is an apocalyptic number.

It is an amenable number.

1363165681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1363165681 is an equidigital number, since it uses as much as digits as its factorization.

1363165681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 1363165681 is about 36921.0736707371. The cubic root of 1363165681 is about 1108.7906318227.

The spelling of 1363165681 in words is "one billion, three hundred sixty-three million, one hundred sixty-five thousand, six hundred eighty-one".