77065809608 has 36 divisors (see below), whose sum is σ = 146997411795. Its totient is φ = 37877662080.

The previous prime is 77065809607. The next prime is 77065809631. The reversal of 77065809608 is 80690856077.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 40966569604 + 36099240004 = 202402^2 + 189998^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=196298.

It is a super-2 number, since 2×77065809608² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77065809607) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47895908 + ... + 47897516.

Almost surely, 2^77065809608 is an apocalyptic number.

It is an amenable number.

77065809608 is a deficient number, since it is larger than the sum of its proper divisors (69931602187).

77065809608 is an frugal number, since it uses more digits than its factorization.

77065809608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 77065809608 in words is "seventy-seven billion, sixty-five million, eight hundred nine thousand, six hundred eight".