77988688977 has 4 divisors (see below), whose sum is σ = 103984918640. Its totient is φ = 51992459316.

The previous prime is 77988688909. The next prime is 77988688993.

77988688977 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77988688977 - 2⁷ = 77988688849 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 77988688977.

It is not an unprimeable number, because it can be changed into a prime (77988608977) 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, 12998114827 + ... + 12998114832.

It is an arithmetic number, because the mean of its divisors is an integer number (25996229660).

Almost surely, 2^77988688977 is an apocalyptic number.

It is an amenable number.

77988688977 is a deficient number, since it is larger than the sum of its proper divisors (25996229663).

77988688977 is a wasteful number, since it uses less digits than its factorization.

77988688977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25996229662.

The product of its digits is 4779565056, while the sum is 84.

The spelling of 77988688977 in words is "seventy-seven billion, nine hundred eighty-eight million, six hundred eighty-eight thousand, nine hundred seventy-seven".