77963655976 has 8 divisors (see below), whose sum is σ = 146181854970. Its totient is φ = 38981827984.

The previous prime is 77963655971. The next prime is 77963655989. The reversal of 77963655976 is 67955636977.

It can be written as a sum of positive squares in only one way, i.e., 47774593476 + 30189062500 = 218574^2 + 173750^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (77963655971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4872728491 + ... + 4872728506.

Almost surely, 2^77963655976 is an apocalyptic number.

It is an amenable number.

77963655976 is a deficient number, since it is larger than the sum of its proper divisors (68218198994).

77963655976 is a wasteful number, since it uses less digits than its factorization.

77963655976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9745457003 (or 9745456999 counting only the distinct ones).

The product of its digits is 450084600, while the sum is 70.

The spelling of 77963655976 in words is "seventy-seven billion, nine hundred sixty-three million, six hundred fifty-five thousand, nine hundred seventy-six".