6777801578077 has 2 divisors, whose sum is σ = 6777801578078. Its totient is φ = 6777801578076.

The previous prime is 6777801578063. The next prime is 6777801578089. The reversal of 6777801578077 is 7708751087776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6439875611481 + 337925966596 = 2537691^2 + 581314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6777801578077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6777801577997 and 6777801578015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6777801570077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388900789038 + 3388900789039.

It is an arithmetic number, because the mean of its divisors is an integer number (3388900789039).

Almost surely, 2^{6777801578077} is an apocalyptic number.

It is an amenable number.

6777801578077 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777801578077 is an equidigital number, since it uses as much as digits as its factorization.

6777801578077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225886080, while the sum is 70.

The spelling of 6777801578077 in words is "six trillion, seven hundred seventy-seven billion, eight hundred one million, five hundred seventy-eight thousand, seventy-seven".