663163181 has 2 divisors, whose sum is σ = 663163182. Its totient is φ = 663163180.

The previous prime is 663163093. The next prime is 663163187. The reversal of 663163181 is 181361366.

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., 636805225 + 26357956 = 25235^2 + 5134^2 .

It is a cyclic number.

It is not a de Polignac number, because 663163181 - 2¹⁸ = 662901037 is a prime.

It is a super-2 number, since 2×663163181² = 879570809268077522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663163187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331581590 + 331581591.

It is an arithmetic number, because the mean of its divisors is an integer number (331581591).

Almost surely, 2^663163181 is an apocalyptic number.

It is an amenable number.

663163181 is a deficient number, since it is larger than the sum of its proper divisors (1).

663163181 is an equidigital number, since it uses as much as digits as its factorization.

663163181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 663163181 is about 25751.9548966676. The cubic root of 663163181 is about 872.0474878923.

The spelling of 663163181 in words is "six hundred sixty-three million, one hundred sixty-three thousand, one hundred eighty-one".