80478879217569 has 18 divisors (see below), whose sum is σ = 135226416101010. Its totient is φ = 45987930981216.

The previous prime is 80478879217531. The next prime is 80478879217579. The reversal of 80478879217569 is 96571297887408.

80478879217569 is a `hidden beast` number, since 8 + 0 + 47 + 8 + 8 + 7 + 9 + 2 + 1 + 7 + 569 = 666.

It can be written as a sum of positive squares in only one way, i.e., 48269701569600 + 32209177647969 = 6947640^2 + 5675313^2 .

It is not a de Polignac number, because 80478879217569 - 2⁹ = 80478879217057 is a prime.

It is a super-2 number, since 2×80478879217569² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80478879217579) 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 17 ways as a sum of consecutive naturals, for example, 91245894364 + ... + 91245895245.

Almost surely, 2^{80478879217569} is an apocalyptic number.

It is an amenable number.

80478879217569 is a deficient number, since it is larger than the sum of its proper divisors (54747536883441).

80478879217569 is a wasteful number, since it uses less digits than its factorization.

80478879217569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182491789629 (or 182491789619 counting only the distinct ones).

The product of its (nonzero) digits is 3413975040, while the sum is 81.

The spelling of 80478879217569 in words is "eighty trillion, four hundred seventy-eight billion, eight hundred seventy-nine million, two hundred seventeen thousand, five hundred sixty-nine".