78664847563 has 2 divisors, whose sum is σ = 78664847564. Its totient is φ = 78664847562.

The previous prime is 78664847561. The next prime is 78664847581. The reversal of 78664847563 is 36574846687.

It is a weak prime.

It is an emirp because it is prime and its reverse (36574846687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78664847563 - 2¹ = 78664847561 is a prime.

It is a super-2 number, since 2×78664847563² (a number of 23 digits) contains 22 as substring.

Together with 78664847561, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 78664847495 and 78664847504.

It is not a weakly prime, because it can be changed into another prime (78664847561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39332423781 + 39332423782.

It is an arithmetic number, because the mean of its divisors is an integer number (39332423782).

Almost surely, 2^78664847563 is an apocalyptic number.

78664847563 is a deficient number, since it is larger than the sum of its proper divisors (1).

78664847563 is an equidigital number, since it uses as much as digits as its factorization.

78664847563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162570240, while the sum is 64.

The spelling of 78664847563 in words is "seventy-eight billion, six hundred sixty-four million, eight hundred forty-seven thousand, five hundred sixty-three".