77806594866 has 256 divisors, whose sum is σ = 216104620032. Its totient is φ = 18023731200.

The previous prime is 77806594829. The next prime is 77806594883. The reversal of 77806594866 is 66849560877.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77806594797 and 77806594806.

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 127 ways as a sum of consecutive naturals, for example, 26346846 + ... + 26349798.

It is an arithmetic number, because the mean of its divisors is an integer number (844158672).

Almost surely, 2^77806594866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77806594866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108052310016).

77806594866 is an abundant number, since it is smaller than the sum of its proper divisors (138298025166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77806594866 is a wasteful number, since it uses less digits than its factorization.

77806594866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137.

The product of its (nonzero) digits is 121927680, while the sum is 66.

The spelling of 77806594866 in words is "seventy-seven billion, eight hundred six million, five hundred ninety-four thousand, eight hundred sixty-six".