12645647155649 has 2 divisors, whose sum is σ = 12645647155650. Its totient is φ = 12645647155648.

The previous prime is 12645647155627. The next prime is 12645647155679. The reversal of 12645647155649 is 94655174654621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11273309880625 + 1372337275024 = 3357575^2 + 1171468^2 .

It is a cyclic number.

It is not a de Polignac number, because 12645647155649 - 2¹⁶ = 12645647090113 is a prime.

It is a super-2 number, since 2×12645647155649² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12645647155679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322823577824 + 6322823577825.

It is an arithmetic number, because the mean of its divisors is an integer number (6322823577825).

Almost surely, 2^{12645647155649} is an apocalyptic number.

It is an amenable number.

12645647155649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12645647155649 is an equidigital number, since it uses as much as digits as its factorization.

12645647155649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728000, while the sum is 65.

The spelling of 12645647155649 in words is "twelve trillion, six hundred forty-five billion, six hundred forty-seven million, one hundred fifty-five thousand, six hundred forty-nine".