77877457313 has 4 divisors (see below), whose sum is σ = 77918686020. Its totient is φ = 77836228608.

The previous prime is 77877457309. The next prime is 77877457391. The reversal of 77877457313 is 31375477877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31375477877 = 941 ⋅33342697.

It can be written as a sum of positive squares in 2 ways, for example, as 61242390784 + 16635066529 = 247472^2 + 128977^2 .

It is a cyclic number.

It is not a de Polignac number, because 77877457313 - 2² = 77877457309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77877417313) 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, 20611520 + ... + 20615297.

It is an arithmetic number, because the mean of its divisors is an integer number (19479671505).

Almost surely, 2^77877457313 is an apocalyptic number.

It is an amenable number.

77877457313 is a deficient number, since it is larger than the sum of its proper divisors (41228707).

77877457313 is a wasteful number, since it uses less digits than its factorization.

77877457313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41228706.

The product of its digits is 24202080, while the sum is 59.

The spelling of 77877457313 in words is "seventy-seven billion, eight hundred seventy-seven million, four hundred fifty-seven thousand, three hundred thirteen".