68291780449 has 4 divisors (see below), whose sum is σ = 70646669460. Its totient is φ = 65936891440.

The previous prime is 68291780441. The next prime is 68291780467. The reversal of 68291780449 is 94408719286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47848500049 + 20443280400 = 218743^2 + 142980^2 .

It is a cyclic number.

It is not a de Polignac number, because 68291780449 - 2³ = 68291780441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68291780393 and 68291780402.

It is not an unprimeable number, because it can be changed into a prime (68291780441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177444462 + ... + 1177444519.

It is an arithmetic number, because the mean of its divisors is an integer number (17661667365).

Almost surely, 2^68291780449 is an apocalyptic number.

It is an amenable number.

68291780449 is a deficient number, since it is larger than the sum of its proper divisors (2354889011).

68291780449 is a wasteful number, since it uses less digits than its factorization.

68291780449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354889010.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 68291780449 in words is "sixty-eight billion, two hundred ninety-one million, seven hundred eighty thousand, four hundred forty-nine".