68705026109 has 4 divisors (see below), whose sum is σ = 68738889660. Its totient is φ = 68671162560.

The previous prime is 68705026087. The next prime is 68705026121. The reversal of 68705026109 is 90162050786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66360336025 + 2344690084 = 257605^2 + 48422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68705026109 is a prime.

It is a super-2 number, since 2×68705026109² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68705026109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68705016109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16928732 + ... + 16932789.

It is an arithmetic number, because the mean of its divisors is an integer number (17184722415).

Almost surely, 2^68705026109 is an apocalyptic number.

It is an amenable number.

68705026109 is a deficient number, since it is larger than the sum of its proper divisors (33863551).

68705026109 is a wasteful number, since it uses less digits than its factorization.

68705026109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33863550.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 68705026109 in words is "sixty-eight billion, seven hundred five million, twenty-six thousand, one hundred nine".