78368275897 has 2 divisors, whose sum is σ = 78368275898. Its totient is φ = 78368275896.

The previous prime is 78368275859. The next prime is 78368275903. The reversal of 78368275897 is 79857286387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53132094016 + 25236181881 = 230504^2 + 158859^2 .

It is a cyclic number.

It is not a de Polignac number, because 78368275897 - 2²³ = 78359887289 is a prime.

It is a super-2 number, since 2×78368275897² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78368275397) 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, 39184137948 + 39184137949.

It is an arithmetic number, because the mean of its divisors is an integer number (39184137949).

Almost surely, 2^78368275897 is an apocalyptic number.

It is an amenable number.

78368275897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78368275897 is an equidigital number, since it uses as much as digits as its factorization.

78368275897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 284497920, while the sum is 70.

The spelling of 78368275897 in words is "seventy-eight billion, three hundred sixty-eight million, two hundred seventy-five thousand, eight hundred ninety-seven".