77700777777 has 24 divisors (see below), whose sum is σ = 131734655936. Its totient is φ = 43200431136.

The previous prime is 77700777769. The next prime is 77700777787. The reversal of 77700777777 is 77777700777.

It is not a de Polignac number, because 77700777777 - 2³ = 77700777769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

77700777777 is a modest number, since divided by 777777 gives 77700 as remainder.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77700777757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16664503 + ... + 16669164.

Almost surely, 2^77700777777 is an apocalyptic number.

It is an amenable number.

77700777777 is a deficient number, since it is larger than the sum of its proper divisors (54033878159).

77700777777 is a wasteful number, since it uses less digits than its factorization.

77700777777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33333717 (or 33333714 counting only the distinct ones).

The product of its (nonzero) digits is 40353607, while the sum is 63.

The spelling of 77700777777 in words is "seventy-seven billion, seven hundred million, seven hundred seventy-seven thousand, seven hundred seventy-seven".