68405338847 has 4 divisors (see below), whose sum is σ = 69229499640. Its totient is φ = 67581178056.

The previous prime is 68405338843. The next prime is 68405338861. The reversal of 68405338847 is 74883350486.

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

It is a cyclic number.

It is not a de Polignac number, because 68405338847 - 2² = 68405338843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68405338792 and 68405338801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68405338843) 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 3 ways as a sum of consecutive naturals, for example, 412080272 + ... + 412080437.

It is an arithmetic number, because the mean of its divisors is an integer number (17307374910).

Almost surely, 2^68405338847 is an apocalyptic number.

68405338847 is a deficient number, since it is larger than the sum of its proper divisors (824160793).

68405338847 is an equidigital number, since it uses as much as digits as its factorization.

68405338847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824160792.

The product of its (nonzero) digits is 15482880, while the sum is 56.

The spelling of 68405338847 in words is "sixty-eight billion, four hundred five million, three hundred thirty-eight thousand, eight hundred forty-seven".