68031265508809 has 16 divisors (see below), whose sum is σ = 72238551570000. Its totient is φ = 63846813859840.

The previous prime is 68031265508779. The next prime is 68031265508831. The reversal of 68031265508809 is 90880556213086.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4055503213584 + 63975762295225 = 2013828^2 + 7998485^2 .

It is a cyclic number.

It is not a de Polignac number, because 68031265508809 - 2⁷ = 68031265508681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68031265508839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517514529 + ... + 517645969.

It is an arithmetic number, because the mean of its divisors is an integer number (4514909473125).

Almost surely, 2^{68031265508809} is an apocalyptic number.

It is an amenable number.

68031265508809 is a deficient number, since it is larger than the sum of its proper divisors (4207286061191).

68031265508809 is a wasteful number, since it uses less digits than its factorization.

68031265508809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218060.

The product of its (nonzero) digits is 24883200, while the sum is 61.

The spelling of 68031265508809 in words is "sixty-eight trillion, thirty-one billion, two hundred sixty-five million, five hundred eight thousand, eight hundred nine".