77734409677 has 2 divisors, whose sum is σ = 77734409678. Its totient is φ = 77734409676.

The previous prime is 77734409617. The next prime is 77734409681. The reversal of 77734409677 is 77690443777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76510879236 + 1223530441 = 276606^2 + 34979^2 .

It is a cyclic number.

It is not a de Polignac number, because 77734409677 - 2²³ = 77726021069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77734409617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38867204838 + 38867204839.

It is an arithmetic number, because the mean of its divisors is an integer number (38867204839).

Almost surely, 2^77734409677 is an apocalyptic number.

It is an amenable number.

77734409677 is a deficient number, since it is larger than the sum of its proper divisors (1).

77734409677 is an equidigital number, since it uses as much as digits as its factorization.

77734409677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43563744, while the sum is 61.

The spelling of 77734409677 in words is "seventy-seven billion, seven hundred thirty-four million, four hundred nine thousand, six hundred seventy-seven".