77789256649 has 16 divisors (see below), whose sum is σ = 85571071488. Its totient is φ = 70264861632.

The previous prime is 77789256637. The next prime is 77789256653. The reversal of 77789256649 is 94665298777.

It is a happy number.

It is not a de Polignac number, because 77789256649 - 2⁹ = 77789256137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77789251649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5392204 + ... + 5406610.

It is an arithmetic number, because the mean of its divisors is an integer number (5348191968).

Almost surely, 2^77789256649 is an apocalyptic number.

It is an amenable number.

77789256649 is a deficient number, since it is larger than the sum of its proper divisors (7781814839).

77789256649 is a wasteful number, since it uses less digits than its factorization.

77789256649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23304.

The product of its digits is 320060160, while the sum is 70.

The spelling of 77789256649 in words is "seventy-seven billion, seven hundred eighty-nine million, two hundred fifty-six thousand, six hundred forty-nine".