78113209841 has 2 divisors, whose sum is σ = 78113209842. Its totient is φ = 78113209840.

The previous prime is 78113209771. The next prime is 78113209879. The reversal of 78113209841 is 14890231187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40684503616 + 37428706225 = 201704^2 + 193465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78113209841 is a prime.

It is a super-2 number, since 2×78113209841² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78113209792 and 78113209801.

It is not a weakly prime, because it can be changed into another prime (78113509841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39056604920 + 39056604921.

It is an arithmetic number, because the mean of its divisors is an integer number (39056604921).

Almost surely, 2^78113209841 is an apocalyptic number.

It is an amenable number.

78113209841 is a deficient number, since it is larger than the sum of its proper divisors (1).

78113209841 is an equidigital number, since it uses as much as digits as its factorization.

78113209841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 78113209841 in words is "seventy-eight billion, one hundred thirteen million, two hundred nine thousand, eight hundred forty-one".