68098968257 has 4 divisors (see below), whose sum is σ = 68596041156. Its totient is φ = 67601895360.

The previous prime is 68098968233. The next prime is 68098968319. The reversal of 68098968257 is 75286989086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75286989086 = 2 ⋅37643494543.

It can be written as a sum of positive squares in 2 ways, for example, as 42693477376 + 25405490881 = 206624^2 + 159391^2 .

It is a cyclic number.

It is not a de Polignac number, because 68098968257 - 2¹² = 68098964161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68098968227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248536244 + ... + 248536517.

It is an arithmetic number, because the mean of its divisors is an integer number (17149010289).

Almost surely, 2^68098968257 is an apocalyptic number.

It is an amenable number.

68098968257 is a deficient number, since it is larger than the sum of its proper divisors (497072899).

68098968257 is a wasteful number, since it uses less digits than its factorization.

68098968257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497072898.

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 68098968257 in words is "sixty-eight billion, ninety-eight million, nine hundred sixty-eight thousand, two hundred fifty-seven".