77815657866 has 16 divisors (see below), whose sum is σ = 159250649184. Its totient is φ = 25335330384.

The previous prime is 77815657859. The next prime is 77815657883. The reversal of 77815657866 is 66875651877.

It is a junction number, because it is equal to n+sod(n) for n = 77815657797 and 77815657806.

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 7 ways as a sum of consecutive naturals, for example, 150805281 + ... + 150805796.

It is an arithmetic number, because the mean of its divisors is an integer number (9953165574).

Almost surely, 2^77815657866 is an apocalyptic number.

77815657866 is an abundant number, since it is smaller than the sum of its proper divisors (81434991318).

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

77815657866 is a wasteful number, since it uses less digits than its factorization.

77815657866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301611125.

The product of its digits is 118540800, while the sum is 66.

The spelling of 77815657866 in words is "seventy-seven billion, eight hundred fifteen million, six hundred fifty-seven thousand, eight hundred sixty-six".