663313107181 has 2 divisors, whose sum is σ = 663313107182. Its totient is φ = 663313107180.

The previous prime is 663313107179. The next prime is 663313107209. The reversal of 663313107181 is 181701313366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532120645156 + 131192462025 = 729466^2 + 362205^2 .

It is a cyclic number.

It is not a de Polignac number, because 663313107181 - 2¹ = 663313107179 is a prime.

It is a super-2 number, since 2×663313107181² (a number of 24 digits) contains 22 as substring.

Together with 663313107179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663313107131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331656553590 + 331656553591.

It is an arithmetic number, because the mean of its divisors is an integer number (331656553591).

Almost surely, 2^663313107181 is an apocalyptic number.

It is an amenable number.

663313107181 is a deficient number, since it is larger than the sum of its proper divisors (1).

663313107181 is an equidigital number, since it uses as much as digits as its factorization.

663313107181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 663313107181 in words is "six hundred sixty-three billion, three hundred thirteen million, one hundred seven thousand, one hundred eighty-one".