68705584421 has 2 divisors, whose sum is σ = 68705584422. Its totient is φ = 68705584420.

The previous prime is 68705584417. The next prime is 68705584457. The reversal of 68705584421 is 12448550786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68565422500 + 140161921 = 261850^2 + 11839^2 .

It is a cyclic number.

It is not a de Polignac number, because 68705584421 - 2² = 68705584417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68705584421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68705584481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34352792210 + 34352792211.

It is an arithmetic number, because the mean of its divisors is an integer number (34352792211).

Almost surely, 2^68705584421 is an apocalyptic number.

It is an amenable number.

68705584421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68705584421 is an equidigital number, since it uses as much as digits as its factorization.

68705584421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 68705584421 in words is "sixty-eight billion, seven hundred five million, five hundred eighty-four thousand, four hundred twenty-one".