68438222449 has 9 divisors (see below), whose sum is σ = 68999191051. Its totient is φ = 67881784360.

The previous prime is 68438222431. The next prime is 68438222483. The reversal of 68438222449 is 94422283486.

The square root of 68438222449 is 261607.

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

It can be written as a sum of positive squares in only one way, i.e., 1702800225 + 66735422224 = 41265^2 + 258332^2 .

It is not a de Polignac number, because 68438222449 - 2¹⁵ = 68438189681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68438222396 and 68438222405.

It is not an unprimeable number, because it can be changed into a prime (68438222429) 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 8 ways as a sum of consecutive naturals, for example, 34269519 + ... + 34271515.

Almost surely, 2^68438222449 is an apocalyptic number.

68438222449 is the 261607-th square number.

68438222449 is the 130804-th centered octagonal number.

It is an amenable number.

68438222449 is a deficient number, since it is larger than the sum of its proper divisors (560968602).

68438222449 is an frugal number, since it uses more digits than its factorization.

68438222449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256 (or 2128 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 52.

The spelling of 68438222449 in words is "sixty-eight billion, four hundred thirty-eight million, two hundred twenty-two thousand, four hundred forty-nine".