78454768913 has 2 divisors, whose sum is σ = 78454768914. Its totient is φ = 78454768912.

The previous prime is 78454768891. The next prime is 78454768921. The reversal of 78454768913 is 31986745487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72386826304 + 6067942609 = 269048^2 + 77897^2 .

It is an emirp because it is prime and its reverse (31986745487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78454768913 - 2³⁰ = 77381027089 is a prime.

It is not a weakly prime, because it can be changed into another prime (78454768993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39227384456 + 39227384457.

It is an arithmetic number, because the mean of its divisors is an integer number (39227384457).

Almost surely, 2^78454768913 is an apocalyptic number.

It is an amenable number.

78454768913 is a deficient number, since it is larger than the sum of its proper divisors (1).

78454768913 is an equidigital number, since it uses as much as digits as its factorization.

78454768913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40642560, while the sum is 62.

The spelling of 78454768913 in words is "seventy-eight billion, four hundred fifty-four million, seven hundred sixty-eight thousand, nine hundred thirteen".