77802478683577 has 2 divisors, whose sum is σ = 77802478683578. Its totient is φ = 77802478683576.

The previous prime is 77802478683511. The next prime is 77802478683581. The reversal of 77802478683577 is 77538687420877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47148217999936 + 30654260683641 = 6866456^2 + 5536629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77802478683577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77802478683497 and 77802478683506.

It is not a weakly prime, because it can be changed into another prime (77802478683977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38901239341788 + 38901239341789.

It is an arithmetic number, because the mean of its divisors is an integer number (38901239341789).

Almost surely, 2^{77802478683577} is an apocalyptic number.

It is an amenable number.

77802478683577 is a deficient number, since it is larger than the sum of its proper divisors (1).

77802478683577 is an equidigital number, since it uses as much as digits as its factorization.

77802478683577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6195732480, while the sum is 79.

The spelling of 77802478683577 in words is "seventy-seven trillion, eight hundred two billion, four hundred seventy-eight million, six hundred eighty-three thousand, five hundred seventy-seven".