78894661423 has 2 divisors, whose sum is σ = 78894661424. Its totient is φ = 78894661422.

The previous prime is 78894661421. The next prime is 78894661427. The reversal of 78894661423 is 32416649887.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (32416649887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78894661423 - 2¹ = 78894661421 is a prime.

Together with 78894661421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78894661421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39447330711 + 39447330712.

It is an arithmetic number, because the mean of its divisors is an integer number (39447330712).

Almost surely, 2^78894661423 is an apocalyptic number.

78894661423 is a deficient number, since it is larger than the sum of its proper divisors (1).

78894661423 is an equidigital number, since it uses as much as digits as its factorization.

78894661423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 58.

The spelling of 78894661423 in words is "seventy-eight billion, eight hundred ninety-four million, six hundred sixty-one thousand, four hundred twenty-three".