78741231697 has 2 divisors, whose sum is σ = 78741231698. Its totient is φ = 78741231696.

The previous prime is 78741231691. The next prime is 78741231719. The reversal of 78741231697 is 79613214787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76281468481 + 2459763216 = 276191^2 + 49596^2 .

It is an emirp because it is prime and its reverse (79613214787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78741231697 - 2¹⁵ = 78741198929 is a prime.

It is not a weakly prime, because it can be changed into another prime (78741231691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39370615848 + 39370615849.

It is an arithmetic number, because the mean of its divisors is an integer number (39370615849).

Almost surely, 2^78741231697 is an apocalyptic number.

It is an amenable number.

78741231697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78741231697 is an equidigital number, since it uses as much as digits as its factorization.

78741231697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 55.

The spelling of 78741231697 in words is "seventy-eight billion, seven hundred forty-one million, two hundred thirty-one thousand, six hundred ninety-seven".