77810873463913 has 4 divisors (see below), whose sum is σ = 77829609531988. Its totient is φ = 77792137395840.

The previous prime is 77810873463899. The next prime is 77810873463929. The reversal of 77810873463913 is 31936437801877.

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 22909931290624 + 54900942173289 = 4786432^2 + 7409517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77810873463913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77810873460913) 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, 9368027808 + ... + 9368036113.

It is an arithmetic number, because the mean of its divisors is an integer number (19457402382997).

Almost surely, 2^{77810873463913} is an apocalyptic number.

It is an amenable number.

77810873463913 is a deficient number, since it is larger than the sum of its proper divisors (18736068075).

77810873463913 is a wasteful number, since it uses less digits than its factorization.

77810873463913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18736068074.

The product of its (nonzero) digits is 128024064, while the sum is 67.

The spelling of 77810873463913 in words is "seventy-seven trillion, eight hundred ten billion, eight hundred seventy-three million, four hundred sixty-three thousand, nine hundred thirteen".