77678171486477 has 2 divisors, whose sum is σ = 77678171486478. Its totient is φ = 77678171486476.

The previous prime is 77678171486467. The next prime is 77678171486507. The reversal of 77678171486477 is 77468417187677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41219109284521 + 36459062201956 = 6420211^2 + 6038134^2 .

It is a cyclic number.

It is not a de Polignac number, because 77678171486477 - 2⁸ = 77678171486221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77678171486407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38839085743238 + 38839085743239.

It is an arithmetic number, because the mean of its divisors is an integer number (38839085743239).

Almost surely, 2^{77678171486477} is an apocalyptic number.

It is an amenable number.

77678171486477 is a deficient number, since it is larger than the sum of its proper divisors (1).

77678171486477 is an equidigital number, since it uses as much as digits as its factorization.

77678171486477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4337012736, while the sum is 80.

The spelling of 77678171486477 in words is "seventy-seven trillion, six hundred seventy-eight billion, one hundred seventy-one million, four hundred eighty-six thousand, four hundred seventy-seven".