77069815771 has 8 divisors (see below), whose sum is σ = 84928455920. Its totient is φ = 69486917472.

The previous prime is 77069815721. The next prime is 77069815777. The reversal of 77069815771 is 17751896077.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77069815771 - 2³³ = 68479881179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77069815777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68934876 + ... + 68935993.

It is an arithmetic number, because the mean of its divisors is an integer number (10616056990).

Almost surely, 2^77069815771 is an apocalyptic number.

77069815771 is a deficient number, since it is larger than the sum of its proper divisors (7858640149).

77069815771 is a wasteful number, since it uses less digits than its factorization.

77069815771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137870925.

The product of its (nonzero) digits is 5186160, while the sum is 58.

The spelling of 77069815771 in words is "seventy-seven billion, sixty-nine million, eight hundred fifteen thousand, seven hundred seventy-one".