77723354813 has 4 divisors (see below), whose sum is σ = 83702074428. Its totient is φ = 71744635200.

The previous prime is 77723354801. The next prime is 77723354837. The reversal of 77723354813 is 31845332777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31845332777 = 59 ⋅539751403.

It can be written as a sum of positive squares in 2 ways, for example, as 23974496569 + 53748858244 = 154837^2 + 231838^2 .

It is a cyclic number.

It is not a de Polignac number, because 77723354813 - 2¹² = 77723350717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77723354213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2989359788 + ... + 2989359813.

It is an arithmetic number, because the mean of its divisors is an integer number (20925518607).

Almost surely, 2^77723354813 is an apocalyptic number.

It is an amenable number.

77723354813 is a deficient number, since it is larger than the sum of its proper divisors (5978719615).

77723354813 is a wasteful number, since it uses less digits than its factorization.

77723354813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5978719614.

The product of its digits is 2963520, while the sum is 50.

The spelling of 77723354813 in words is "seventy-seven billion, seven hundred twenty-three million, three hundred fifty-four thousand, eight hundred thirteen".