78394603697 has 2 divisors, whose sum is σ = 78394603698. Its totient is φ = 78394603696.

The previous prime is 78394603691. The next prime is 78394603739. The reversal of 78394603697 is 79630649387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68820176896 + 9574426801 = 262336^2 + 97849^2 .

It is an emirp because it is prime and its reverse (79630649387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78394603697 - 2⁴ = 78394603681 is a prime.

It is a super-2 number, since 2×78394603697² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78394603691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39197301848 + 39197301849.

It is an arithmetic number, because the mean of its divisors is an integer number (39197301849).

Almost surely, 2^78394603697 is an apocalyptic number.

It is an amenable number.

78394603697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78394603697 is an equidigital number, since it uses as much as digits as its factorization.

78394603697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41150592, while the sum is 62.

The spelling of 78394603697 in words is "seventy-eight billion, three hundred ninety-four million, six hundred three thousand, six hundred ninety-seven".