77081665816 has 16 divisors (see below), whose sum is σ = 144909469800. Its totient is φ = 38439140544.

The previous prime is 77081665729. The next prime is 77081665861. The reversal of 77081665816 is 61856618077.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 12708325 + ... + 12714388.

Almost surely, 2^77081665816 is an apocalyptic number.

It is an amenable number.

77081665816 is a deficient number, since it is larger than the sum of its proper divisors (67827803984).

77081665816 is a wasteful number, since it uses less digits than its factorization.

77081665816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25423098 (or 25423094 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 77081665816 in words is "seventy-seven billion, eighty-one million, six hundred sixty-five thousand, eight hundred sixteen".