78564479999 has 4 divisors (see below), whose sum is σ = 78963284664. Its totient is φ = 78165675336.

The previous prime is 78564479963. The next prime is 78564480047. The reversal of 78564479999 is 99997446587.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78564479999 - 2¹⁶ = 78564414463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78564479899) 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 in 3 ways as a sum of consecutive naturals, for example, 199402037 + ... + 199402430.

It is an arithmetic number, because the mean of its divisors is an integer number (19740821166).

Almost surely, 2^78564479999 is an apocalyptic number.

78564479999 is a deficient number, since it is larger than the sum of its proper divisors (398804665).

78564479999 is a wasteful number, since it uses less digits than its factorization.

78564479999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398804664.

The product of its digits is 1234517760, while the sum is 77.

The spelling of 78564479999 in words is "seventy-eight billion, five hundred sixty-four million, four hundred seventy-nine thousand, nine hundred ninety-nine".