77699359809 has 16 divisors (see below), whose sum is σ = 121881349440. Its totient is φ = 48752539200.

The previous prime is 77699359769. The next prime is 77699359813. The reversal of 77699359809 is 90895399677.

It is a happy number.

It is not a de Polignac number, because 77699359809 - 2⁷ = 77699359681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77699359819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84639367 + ... + 84640284.

It is an arithmetic number, because the mean of its divisors is an integer number (7617584340).

Almost surely, 2^77699359809 is an apocalyptic number.

It is an amenable number.

77699359809 is a deficient number, since it is larger than the sum of its proper divisors (44181989631).

77699359809 is a wasteful number, since it uses less digits than its factorization.

77699359809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169279677 (or 169279671 counting only the distinct ones).

The product of its (nonzero) digits is 231472080, while the sum is 72.

The spelling of 77699359809 in words is "seventy-seven billion, six hundred ninety-nine million, three hundred fifty-nine thousand, eight hundred nine".