77857966975877 has 4 divisors (see below), whose sum is σ = 84935963973696. Its totient is φ = 70779969978060.

The previous prime is 77857966975801. The next prime is 77857966975907.

77857966975877 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77857966975877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77857966971877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3538998498893 + ... + 3538998498914.

It is an arithmetic number, because the mean of its divisors is an integer number (21233990993424).

Almost surely, 2^{77857966975877} is an apocalyptic number.

It is an amenable number.

77857966975877 is a deficient number, since it is larger than the sum of its proper divisors (7077996997819).

77857966975877 is a wasteful number, since it uses less digits than its factorization.

77857966975877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077996997818.

The product of its digits is 548903174400, while the sum is 98.

The spelling of 77857966975877 in words is "seventy-seven trillion, eight hundred fifty-seven billion, nine hundred sixty-six million, nine hundred seventy-five thousand, eight hundred seventy-seven".