77840060066105 has 4 divisors (see below), whose sum is σ = 93408072079332. Its totient is φ = 62272048052880.

The previous prime is 77840060066101. The next prime is 77840060066147. The reversal of 77840060066105 is 50166006004877.

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 42413125151296 + 35426934914809 = 6512536^2 + 5952053^2 .

It is not a de Polignac number, because 77840060066105 - 2² = 77840060066101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77840060066101) 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, 7784006006606 + ... + 7784006006615.

It is an arithmetic number, because the mean of its divisors is an integer number (23352018019833).

Almost surely, 2^{77840060066105} is an apocalyptic number.

It is an amenable number.

77840060066105 is a deficient number, since it is larger than the sum of its proper divisors (15568012013227).

77840060066105 is a wasteful number, since it uses less digits than its factorization.

77840060066105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15568012013226.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 77840060066105 in words is "seventy-seven trillion, eight hundred forty billion, sixty million, sixty-six thousand, one hundred five".