478891681918 has 32 divisors (see below), whose sum is σ = 780742924416. Its totient is φ = 218985973248.

The previous prime is 478891681913. The next prime is 478891681949. The reversal of 478891681918 is 819186198874.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478891681913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7881771 + ... + 7942297.

It is an arithmetic number, because the mean of its divisors is an integer number (24398216388).

Almost surely, 2^478891681918 is an apocalyptic number.

478891681918 is a deficient number, since it is larger than the sum of its proper divisors (301851242498).

478891681918 is a wasteful number, since it uses less digits than its factorization.

478891681918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63348.

The product of its digits is 55738368, while the sum is 70.

The spelling of 478891681918 in words is "four hundred seventy-eight billion, eight hundred ninety-one million, six hundred eighty-one thousand, nine hundred eighteen".