77894543457 has 16 divisors (see below), whose sum is σ = 115747975360. Its totient is φ = 51772802400.

The previous prime is 77894543449. The next prime is 77894543497. The reversal of 77894543457 is 75434549877.

77894543457 is a `hidden beast` number, since 7 + 7 + 89 + 4 + 543 + 4 + 5 + 7 = 666.

It is not a de Polignac number, because 77894543457 - 2³ = 77894543449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77894543394 and 77894543403.

It is not an unprimeable number, because it can be changed into a prime (77894543497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4349044 + ... + 4366917.

It is an arithmetic number, because the mean of its divisors is an integer number (7234248460).

Almost surely, 2^77894543457 is an apocalyptic number.

It is an amenable number.

77894543457 is a deficient number, since it is larger than the sum of its proper divisors (37853431903).

77894543457 is a wasteful number, since it uses less digits than its factorization.

77894543457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8716301 (or 8716295 counting only the distinct ones).

The product of its digits is 118540800, while the sum is 63.

The spelling of 77894543457 in words is "seventy-seven billion, eight hundred ninety-four million, five hundred forty-three thousand, four hundred fifty-seven".