12655663081 has 2 divisors, whose sum is σ = 12655663082. Its totient is φ = 12655663080.

The previous prime is 12655663067. The next prime is 12655663123. The reversal of 12655663081 is 18036655621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11624289856 + 1031373225 = 107816^2 + 32115^2 .

It is a cyclic number.

It is not a de Polignac number, because 12655663081 - 2⁷ = 12655662953 is a prime.

It is a super-2 number, since 2×12655663081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12655663001) 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, 6327831540 + 6327831541.

It is an arithmetic number, because the mean of its divisors is an integer number (6327831541).

Almost surely, 2^12655663081 is an apocalyptic number.

It is an amenable number.

12655663081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12655663081 is an equidigital number, since it uses as much as digits as its factorization.

12655663081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 12655663081 in words is "twelve billion, six hundred fifty-five million, six hundred sixty-three thousand, eighty-one".