68609775842609 has 4 divisors (see below), whose sum is σ = 68876739951204. Its totient is φ = 68342811734016.

The previous prime is 68609775842579. The next prime is 68609775842611. The reversal of 68609775842609 is 90624857790686.

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 40440187747600 + 28169588095009 = 6359260^2 + 5307503^2 .

It is a cyclic number.

It is not a de Polignac number, because 68609775842609 - 2²⁸ = 68609507407153 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 68609775842609.

It is not an unprimeable number, because it can be changed into a prime (68609775142609) 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, 133482053912 + ... + 133482054425.

It is an arithmetic number, because the mean of its divisors is an integer number (17219184987801).

Almost surely, 2^{68609775842609} is an apocalyptic number.

It is an amenable number.

68609775842609 is a deficient number, since it is larger than the sum of its proper divisors (266964108595).

68609775842609 is a wasteful number, since it uses less digits than its factorization.

68609775842609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266964108594.

The product of its (nonzero) digits is 2194698240, while the sum is 77.

The spelling of 68609775842609 in words is "sixty-eight trillion, six hundred nine billion, seven hundred seventy-five million, eight hundred forty-two thousand, six hundred nine".