77678171486487 has 24 divisors (see below), whose sum is σ = 131817503130768. Its totient is φ = 43456319712000.

The previous prime is 77678171486477. The next prime is 77678171486507. The reversal of 77678171486487 is 78468417187677.

77678171486487 is a `hidden beast` number, since 7 + 7 + 67 + 8 + 1 + 71 + 4 + 8 + 6 + 487 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-77678171486487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77678171486407) 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, 30177998514 + ... + 30178001087.

It is an arithmetic number, because the mean of its divisors is an integer number (5492395963782).

Almost surely, 2^{77678171486487} is an apocalyptic number.

77678171486487 is a deficient number, since it is larger than the sum of its proper divisors (54139331644281).

77678171486487 is a wasteful number, since it uses less digits than its factorization.

77678171486487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60355999631 (or 60355999628 counting only the distinct ones).

The product of its digits is 4956585984, while the sum is 81.

The spelling of 77678171486487 in words is "seventy-seven trillion, six hundred seventy-eight billion, one hundred seventy-one million, four hundred eighty-six thousand, four hundred eighty-seven".