77734863566197 has 2 divisors, whose sum is σ = 77734863566198. Its totient is φ = 77734863566196.

The previous prime is 77734863566189. The next prime is 77734863566237. The reversal of 77734863566197 is 79166536843777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67279464188836 + 10455399377361 = 8202406^2 + 3233481^2 .

It is a cyclic number.

It is not a de Polignac number, because 77734863566197 - 2³ = 77734863566189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77734863566167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38867431783098 + 38867431783099.

It is an arithmetic number, because the mean of its divisors is an integer number (38867431783099).

Almost surely, 2^{77734863566197} is an apocalyptic number.

It is an amenable number.

77734863566197 is a deficient number, since it is larger than the sum of its proper divisors (1).

77734863566197 is an equidigital number, since it uses as much as digits as its factorization.

77734863566197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6721263360, while the sum is 79.

The spelling of 77734863566197 in words is "seventy-seven trillion, seven hundred thirty-four billion, eight hundred sixty-three million, five hundred sixty-six thousand, one hundred ninety-seven".