77768486777 has 4 divisors (see below), whose sum is σ = 77769498996. Its totient is φ = 77767474560.

The previous prime is 77768486749. The next prime is 77768486813.

77768486777 is nontrivially palindromic in base 10.

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 37686845161 + 40081641616 = 194131^2 + 200204^2 .

It is a cyclic number.

It is not a de Polignac number, because 77768486777 - 2⁶ = 77768486713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77768486707) 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, 380468 + ... + 547989.

It is an arithmetic number, because the mean of its divisors is an integer number (19442374749).

Almost surely, 2^77768486777 is an apocalyptic number.

It is an amenable number.

77768486777 is a deficient number, since it is larger than the sum of its proper divisors (1012219).

77768486777 is an equidigital number, since it uses as much as digits as its factorization.

77768486777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012218.

The product of its digits is 1084253184, while the sum is 74.

The spelling of 77768486777 in words is "seventy-seven billion, seven hundred sixty-eight million, four hundred eighty-six thousand, seven hundred seventy-seven".