63449843422681 has 27 divisors (see below), whose sum is σ = 67906790365599. Its totient is φ = 59276624802912.

The previous prime is 63449843422499. The next prime is 63449843422703. The reversal of 63449843422681 is 18622434894436.

The square root of 63449843422681 is 7965541.

It is a perfect power (a square), and thus also a powerful number.

63449843422681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 36017222059225 + 27432621363456 = 6001435^2 + 5237616^2 .

It is not a de Polignac number, because 63449843422681 - 2⁹ = 63449843422169 is a prime.

It is a super-2 number, since 2×63449843422681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63449843482681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11048202496 + ... + 11048208238.

It is an arithmetic number, because the mean of its divisors is an integer number (2515066309837).

Almost surely, 2^{63449843422681} is an apocalyptic number.

63449843422681 is the 7965541-st square number.

63449843422681 is the 3982771-st centered octagonal number.

It is an amenable number.

63449843422681 is a deficient number, since it is larger than the sum of its proper divisors (4456946942918).

63449843422681 is an frugal number, since it uses more digits than its factorization.

63449843422681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11670 (or 5835 counting only the distinct ones).

The product of its digits is 191102976, while the sum is 64.

The spelling of 63449843422681 in words is "sixty-three trillion, four hundred forty-nine billion, eight hundred forty-three million, four hundred twenty-two thousand, six hundred eighty-one".