77734407197 has 2 divisors, whose sum is σ = 77734407198. Its totient is φ = 77734407196.

The previous prime is 77734407193. The next prime is 77734407227. The reversal of 77734407197 is 79170443777.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70695364996 + 7039042201 = 265886^2 + 83899^2 .

It is a cyclic number.

It is not a de Polignac number, because 77734407197 - 2² = 77734407193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77734407193) 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, 38867203598 + 38867203599.

It is an arithmetic number, because the mean of its divisors is an integer number (38867203599).

Almost surely, 2^77734407197 is an apocalyptic number.

It is an amenable number.

77734407197 is a deficient number, since it is larger than the sum of its proper divisors (1).

77734407197 is an equidigital number, since it uses as much as digits as its factorization.

77734407197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7260624, while the sum is 56.

The spelling of 77734407197 in words is "seventy-seven billion, seven hundred thirty-four million, four hundred seven thousand, one hundred ninety-seven".