77699699677 has 2 divisors, whose sum is σ = 77699699678. Its totient is φ = 77699699676.

The previous prime is 77699699573. The next prime is 77699699711.

77699699677 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., 76093774201 + 1605925476 = 275851^2 + 40074^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77699699677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77699699677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77699699177) 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 as a sum of consecutive naturals, namely, 38849849838 + 38849849839.

It is an arithmetic number, because the mean of its divisors is an integer number (38849849839).

Almost surely, 2^77699699677 is an apocalyptic number.

It is an amenable number.

77699699677 is a deficient number, since it is larger than the sum of its proper divisors (1).

77699699677 is an equidigital number, since it uses as much as digits as its factorization.

77699699677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402639576, while the sum is 82.

The spelling of 77699699677 in words is "seventy-seven billion, six hundred ninety-nine million, six hundred ninety-nine thousand, six hundred seventy-seven".