77686868677 has 6 divisors (see below), whose sum is σ = 85391351654. Its totient is φ = 70624425960.

The previous prime is 77686868671. The next prime is 77686868681.

77686868677 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 50845289121 + 26841579556 = 225489^2 + 163834^2 .

It is not a de Polignac number, because 77686868677 - 2¹⁹ = 77686344389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77686868671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 321019998 + ... + 321020239.

Almost surely, 2^77686868677 is an apocalyptic number.

It is an amenable number.

77686868677 is a deficient number, since it is larger than the sum of its proper divisors (7704482977).

77686868677 is a wasteful number, since it uses less digits than its factorization.

77686868677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642040259 (or 642040248 counting only the distinct ones).

The product of its digits is 1593188352, while the sum is 76.

The spelling of 77686868677 in words is "seventy-seven billion, six hundred eighty-six million, eight hundred sixty-eight thousand, six hundred seventy-seven".