77964788655 has 80 divisors (see below), whose sum is σ = 150644059104. Its totient is φ = 38348432640.

The previous prime is 77964788653. The next prime is 77964788813. The reversal of 77964788655 is 55688746977.

77964788655 is a `hidden beast` number, since 7 + 7 + 96 + 478 + 8 + 65 + 5 = 666.

It is not a de Polignac number, because 77964788655 - 2¹ = 77964788653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77964788653) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6506820 + ... + 6518790.

Almost surely, 2^77964788655 is an apocalyptic number.

77964788655 is a deficient number, since it is larger than the sum of its proper divisors (72679270449).

77964788655 is a wasteful number, since it uses less digits than its factorization.

77964788655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13238 (or 13229 counting only the distinct ones).

The product of its digits is 711244800, while the sum is 72.

The spelling of 77964788655 in words is "seventy-seven billion, nine hundred sixty-four million, seven hundred eighty-eight thousand, six hundred fifty-five".