77685458677 has 2 divisors, whose sum is σ = 77685458678. Its totient is φ = 77685458676.

The previous prime is 77685458659. The next prime is 77685458681.

77685458677 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76862572081 + 822886596 = 277241^2 + 28686^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77685458677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77685458687) by changing a digit.

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 as a sum of consecutive naturals, namely, 38842729338 + 38842729339.

It is an arithmetic number, because the mean of its divisors is an integer number (38842729339).

Almost surely, 2^77685458677 is an apocalyptic number.

It is an amenable number.

77685458677 is a deficient number, since it is larger than the sum of its proper divisors (1).

77685458677 is an equidigital number, since it uses as much as digits as its factorization.

77685458677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 553190400, while the sum is 70.

The spelling of 77685458677 in words is "seventy-seven billion, six hundred eighty-five million, four hundred fifty-eight thousand, six hundred seventy-seven".