68569261813 has 12 divisors (see below), whose sum is σ = 78617179908. Its totient is φ = 59571482880.

The previous prime is 68569261807. The next prime is 68569261853. The reversal of 68569261813 is 31816296586.

It can be written as a sum of positive squares in 6 ways, for example, as 3267036964 + 65302224849 = 57158^2 + 255543^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68569261813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68569261853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11930518 + ... + 11936263.

It is an arithmetic number, because the mean of its divisors is an integer number (6551431659).

Almost surely, 2^68569261813 is an apocalyptic number.

It is an amenable number.

68569261813 is a deficient number, since it is larger than the sum of its proper divisors (10047918095).

68569261813 is a wasteful number, since it uses less digits than its factorization.

68569261813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23866824 (or 23866811 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 55.

The spelling of 68569261813 in words is "sixty-eight billion, five hundred sixty-nine million, two hundred sixty-one thousand, eight hundred thirteen".