77786810287856 has 40 divisors (see below), whose sum is σ = 151222075948944. Its totient is φ = 38761790630400.

The previous prime is 77786810287847. The next prime is 77786810287867. The reversal of 77786810287856 is 65878201868777.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37807556 + ... + 39811868.

Almost surely, 2^{77786810287856} is an apocalyptic number.

It is an amenable number.

77786810287856 is a deficient number, since it is larger than the sum of its proper divisors (73435265661088).

77786810287856 is a wasteful number, since it uses less digits than its factorization.

77786810287856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012529 (or 2012523 counting only the distinct ones).

The product of its (nonzero) digits is 3540418560, while the sum is 80.

The spelling of 77786810287856 in words is "seventy-seven trillion, seven hundred eighty-six billion, eight hundred ten million, two hundred eighty-seven thousand, eight hundred fifty-six".