78228446017499 has 16 divisors (see below), whose sum is σ = 85727657963520. Its totient is φ = 71063716106880.

The previous prime is 78228446017493. The next prime is 78228446017511. The reversal of 78228446017499 is 99471064482287.

It is a cyclic number.

It is not a de Polignac number, because 78228446017499 - 2⁸ = 78228446017243 is a prime.

It is a super-2 number, since 2×78228446017499² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78228446017493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195632819 + ... + 196032284.

It is an arithmetic number, because the mean of its divisors is an integer number (5357978622720).

Almost surely, 2^{78228446017499} is an apocalyptic number.

78228446017499 is a deficient number, since it is larger than the sum of its proper divisors (7499211946021).

78228446017499 is a wasteful number, since it uses less digits than its factorization.

78228446017499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391665530.

The product of its (nonzero) digits is 390168576, while the sum is 71.

The spelling of 78228446017499 in words is "seventy-eight trillion, two hundred twenty-eight billion, four hundred forty-six million, seventeen thousand, four hundred ninety-nine".