68842950409 has 4 divisors (see below), whose sum is σ = 69474537220. Its totient is φ = 68211363600.

The previous prime is 68842950403. The next prime is 68842950413. The reversal of 68842950409 is 90405924886.

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 16110717184 + 52732233225 = 126928^2 + 229635^2 .

It is a cyclic number.

It is not a de Polignac number, because 68842950409 - 2⁹ = 68842949897 is a prime.

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 68842950409.

It is not an unprimeable number, because it can be changed into a prime (68842950403) 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, 315793242 + ... + 315793459.

It is an arithmetic number, because the mean of its divisors is an integer number (17368634305).

Almost surely, 2^68842950409 is an apocalyptic number.

It is an amenable number.

68842950409 is a deficient number, since it is larger than the sum of its proper divisors (631586811).

68842950409 is a wasteful number, since it uses less digits than its factorization.

68842950409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631586810.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 68842950409 in words is "sixty-eight billion, eight hundred forty-two million, nine hundred fifty thousand, four hundred nine".