77776667777 has 12 divisors (see below), whose sum is σ = 82326726468. Its totient is φ = 73431907200.

The previous prime is 77776667767. The next prime is 77776667809.

77776667777 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 4014996496 + 73761671281 = 63364^2 + 271591^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77776667777 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77776667747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 947588 + ... + 1026389.

It is an arithmetic number, because the mean of its divisors is an integer number (6860560539).

Almost surely, 2^77776667777 is an apocalyptic number.

It is an amenable number.

77776667777 is a deficient number, since it is larger than the sum of its proper divisors (4550058691).

77776667777 is a wasteful number, since it uses less digits than its factorization.

77776667777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974080 (or 1974049 counting only the distinct ones).

The product of its digits is 1245197016, while the sum is 74.

The spelling of 77776667777 in words is "seventy-seven billion, seven hundred seventy-six million, six hundred sixty-seven thousand, seven hundred seventy-seven".