77777777777776 has 10 divisors (see below), whose sum is σ = 150694444444472. Its totient is φ = 38888888888880.

The previous prime is 77777777777753. The next prime is 77777777777837. The reversal of 77777777777776 is 67777777777777.

It is a happy number.

77777777777776 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2430555555540 + ... + 2430555555571.

Almost surely, 2^{77777777777776} is an apocalyptic number.

It is an amenable number.

77777777777776 is a deficient number, since it is larger than the sum of its proper divisors (72916666666696).

77777777777776 is a wasteful number, since it uses less digits than its factorization.

77777777777776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861111111119 (or 4861111111113 counting only the distinct ones).

The product of its digits is 581334062442, while the sum is 97.

Subtracting from 77777777777776 its reverse (67777777777777), we obtain a palindrome (9999999999999).

The spelling of 77777777777776 in words is "seventy-seven trillion, seven hundred seventy-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-six".