77956865977 has 8 divisors (see below), whose sum is σ = 78655154760. Its totient is φ = 77261518080.

The previous prime is 77956865947. The next prime is 77956866023.

77956865977 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 5302898041 + 72653967936 = 72821^2 + 269544^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77956865977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77956865927) 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, 681952 + ... + 788017.

It is an arithmetic number, because the mean of its divisors is an integer number (9831894345).

Almost surely, 2^77956865977 is an apocalyptic number.

It is an amenable number.

77956865977 is a deficient number, since it is larger than the sum of its proper divisors (698288783).

77956865977 is a wasteful number, since it uses less digits than its factorization.

77956865977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470443.

The product of its digits is 1400263200, while the sum is 76.

The spelling of 77956865977 in words is "seventy-seven billion, nine hundred fifty-six million, eight hundred sixty-five thousand, nine hundred seventy-seven".