77198314121 has 2 divisors, whose sum is σ = 77198314122. Its totient is φ = 77198314120.

The previous prime is 77198314009. The next prime is 77198314153. The reversal of 77198314121 is 12141389177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70643792521 + 6554521600 = 265789^2 + 80960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77198314121 is a prime.

It is not a weakly prime, because it can be changed into another prime (77198314421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38599157060 + 38599157061.

It is an arithmetic number, because the mean of its divisors is an integer number (38599157061).

Almost surely, 2^77198314121 is an apocalyptic number.

It is an amenable number.

77198314121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77198314121 is an equidigital number, since it uses as much as digits as its factorization.

77198314121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 44.

The spelling of 77198314121 in words is "seventy-seven billion, one hundred ninety-eight million, three hundred fourteen thousand, one hundred twenty-one".