68136811 has 4 divisors (see below), whose sum is σ = 69721432. Its totient is φ = 66552192.

The previous prime is 68136797. The next prime is 68136823. The reversal of 68136811 is 11863186.

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

It is a cyclic number.

It is not a de Polignac number, because 68136811 - 2¹⁷ = 68005739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68136841) 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, 792246 + ... + 792331.

It is an arithmetic number, because the mean of its divisors is an integer number (17430358).

Almost surely, 2^68136811 is an apocalyptic number.

68136811 is a deficient number, since it is larger than the sum of its proper divisors (1584621).

68136811 is a wasteful number, since it uses less digits than its factorization.

68136811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584620.

The product of its digits is 6912, while the sum is 34.

The square root of 68136811 is about 8254.5024683502. The cubic root of 68136811 is about 408.4390598179.

Adding to 68136811 its reverse (11863186), we get a palindrome (79999997).

The spelling of 68136811 in words is "sixty-eight million, one hundred thirty-six thousand, eight hundred eleven".