77805551248 has 20 divisors (see below), whose sum is σ = 150753950460. Its totient is φ = 38901305984.

The previous prime is 77805551231. The next prime is 77805551281. The reversal of 77805551248 is 84215550877.

It can be written as a sum of positive squares in 2 ways, for example, as 53133938064 + 24671613184 = 230508^2 + 157072^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77805551195 and 77805551204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437286 + ... + 588922.

It is an arithmetic number, because the mean of its divisors is an integer number (7537697523).

Almost surely, 2^77805551248 is an apocalyptic number.

It is an amenable number.

77805551248 is a deficient number, since it is larger than the sum of its proper divisors (72948399212).

77805551248 is a wasteful number, since it uses less digits than its factorization.

77805551248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183714 (or 183708 counting only the distinct ones).

The product of its (nonzero) digits is 3136000, while the sum is 52.

The spelling of 77805551248 in words is "seventy-seven billion, eight hundred five million, five hundred fifty-one thousand, two hundred forty-eight".