68821803767809 has 4 divisors (see below), whose sum is σ = 68833892620116. Its totient is φ = 68809714915504.

The previous prime is 68821803767803. The next prime is 68821803767839. The reversal of 68821803767809 is 90876730812886.

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 33047229763584 + 35774574004225 = 5748672^2 + 5981185^2 .

It is a cyclic number.

It is not a de Polignac number, because 68821803767809 - 2³⁵ = 68787444029441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68821803767803) 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, 6044417614 + ... + 6044428999.

It is an arithmetic number, because the mean of its divisors is an integer number (17208473155029).

Almost surely, 2^{68821803767809} is an apocalyptic number.

It is an amenable number.

68821803767809 is a deficient number, since it is larger than the sum of its proper divisors (12088852307).

68821803767809 is a wasteful number, since it uses less digits than its factorization.

68821803767809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12088852306.

The product of its (nonzero) digits is 390168576, while the sum is 73.

The spelling of 68821803767809 in words is "sixty-eight trillion, eight hundred twenty-one billion, eight hundred three million, seven hundred sixty-seven thousand, eight hundred nine".