77700077777 has 16 divisors (see below), whose sum is σ = 90720672000. Its totient is φ = 66520440000.

The previous prime is 77700077743. The next prime is 77700077797. The reversal of 77700077777 is 77777000777.

It is a happy number.

It is not a de Polignac number, because 77700077777 - 2³⁰ = 76626335953 is a prime.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77700077717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152777 + ... + 422777.

It is an arithmetic number, because the mean of its divisors is an integer number (5670042000).

Almost surely, 2^77700077777 is an apocalyptic number.

It is an amenable number.

77700077777 is a deficient number, since it is larger than the sum of its proper divisors (13020594223).

77700077777 is an equidigital number, since it uses as much as digits as its factorization.

77700077777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270861 (or 270847 counting only the distinct ones).

The product of its (nonzero) digits is 5764801, while the sum is 56.

The spelling of 77700077777 in words is "seventy-seven billion, seven hundred million, seventy-seven thousand, seven hundred seventy-seven".