68509811 has 4 divisors (see below), whose sum is σ = 70180824. Its totient is φ = 66838800.

The previous prime is 68509787. The next prime is 68509823. The reversal of 68509811 is 11890586.

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 68509811 - 2¹⁰ = 68508787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68509841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835445 + ... + 835526.

It is an arithmetic number, because the mean of its divisors is an integer number (17545206).

Almost surely, 2^68509811 is an apocalyptic number.

68509811 is a deficient number, since it is larger than the sum of its proper divisors (1671013).

68509811 is a wasteful number, since it uses less digits than its factorization.

68509811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671012.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 68509811 is about 8277.0653615880. The cubic root of 68509811 is about 409.1830072346.

It can be divided in two parts, 6850 and 9811, that added together give a palindrome (16661).

The spelling of 68509811 in words is "sixty-eight million, five hundred nine thousand, eight hundred eleven".