77786106328681 has 2 divisors, whose sum is σ = 77786106328682. Its totient is φ = 77786106328680.

The previous prime is 77786106328669. The next prime is 77786106328691. The reversal of 77786106328681 is 18682360168777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70773672718681 + 7012433610000 = 8412709^2 + 2648100^2 .

It is a cyclic number.

It is not a de Polignac number, because 77786106328681 - 2²⁷ = 77785972110953 is a prime.

It is a super-2 number, since 2×77786106328681² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77786106328681.

It is not a weakly prime, because it can be changed into another prime (77786106328691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38893053164340 + 38893053164341.

It is an arithmetic number, because the mean of its divisors is an integer number (38893053164341).

Almost surely, 2^{77786106328681} is an apocalyptic number.

It is an amenable number.

77786106328681 is a deficient number, since it is larger than the sum of its proper divisors (1).

77786106328681 is an equidigital number, since it uses as much as digits as its factorization.

77786106328681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 227598336, while the sum is 70.

The spelling of 77786106328681 in words is "seventy-seven trillion, seven hundred eighty-six billion, one hundred six million, three hundred twenty-eight thousand, six hundred eighty-one".