7766555556677 has 2 divisors, whose sum is σ = 7766555556678. Its totient is φ = 7766555556676.

The previous prime is 7766555556671. The next prime is 7766555556679.

7766555556677 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., 4620990823201 + 3145564733476 = 2149649^2 + 1773574^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 7766555556677 - 2⁸ = 7766555556421 is a prime.

Together with 7766555556679, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 7766555556598 and 7766555556607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7766555556671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3883277778338 + 3883277778339.

It is an arithmetic number, because the mean of its divisors is an integer number (3883277778339).

Almost surely, 2^{7766555556677} is an apocalyptic number.

It is an amenable number.

7766555556677 is a deficient number, since it is larger than the sum of its proper divisors (1).

7766555556677 is an equidigital number, since it uses as much as digits as its factorization.

7766555556677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9724050000, while the sum is 77.

The spelling of 7766555556677 in words is "seven trillion, seven hundred sixty-six billion, five hundred fifty-five million, five hundred fifty-six thousand, six hundred seventy-seven".