68849384045521 has 2 divisors, whose sum is σ = 68849384045522. Its totient is φ = 68849384045520.

The previous prime is 68849384045483. The next prime is 68849384045531. The reversal of 68849384045521 is 12554048394886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67552552769296 + 1296831276225 = 8219036^2 + 1138785^2 .

It is a cyclic number.

It is not a de Polignac number, because 68849384045521 - 2²⁹ = 68848847174609 is a prime.

It is a super-2 number, since 2×68849384045521² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68849384045531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34424692022760 + 34424692022761.

It is an arithmetic number, because the mean of its divisors is an integer number (34424692022761).

Almost surely, 2^{68849384045521} is an apocalyptic number.

It is an amenable number.

68849384045521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68849384045521 is an equidigital number, since it uses as much as digits as its factorization.

68849384045521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 265420800, while the sum is 67.

The spelling of 68849384045521 in words is "sixty-eight trillion, eight hundred forty-nine billion, three hundred eighty-four million, forty-five thousand, five hundred twenty-one".