68355044055409 has 2 divisors, whose sum is σ = 68355044055410. Its totient is φ = 68355044055408.

The previous prime is 68355044055367. The next prime is 68355044055437. The reversal of 68355044055409 is 90455044055386.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38026067574784 + 30328976480625 = 6166528^2 + 5507175^2 .

It is a cyclic number.

It is not a de Polignac number, because 68355044055409 - 2¹⁷ = 68355043924337 is a prime.

It is not a weakly prime, because it can be changed into another prime (68355044055479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34177522027704 + 34177522027705.

It is an arithmetic number, because the mean of its divisors is an integer number (34177522027705).

Almost surely, 2^{68355044055409} is an apocalyptic number.

It is an amenable number.

68355044055409 is a deficient number, since it is larger than the sum of its proper divisors (1).

68355044055409 is an equidigital number, since it uses as much as digits as its factorization.

68355044055409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840000, while the sum is 58.

The spelling of 68355044055409 in words is "sixty-eight trillion, three hundred fifty-five billion, forty-four million, fifty-five thousand, four hundred nine".