478338911999 has 4 divisors (see below), whose sum is σ = 515134212936. Its totient is φ = 441543611064.

The previous prime is 478338911993. The next prime is 478338912017. The reversal of 478338911999 is 999119833874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999119833874 = 2 ⋅499559916937.

It is a cyclic number.

It is not a de Polignac number, because 478338911999 - 2²⁴ = 478322134783 is a prime.

It is a super-2 number, since 2×478338911999² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478338911993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18397650449 + ... + 18397650474.

It is an arithmetic number, because the mean of its divisors is an integer number (128783553234).

Almost surely, 2^478338911999 is an apocalyptic number.

478338911999 is a deficient number, since it is larger than the sum of its proper divisors (36795300937).

478338911999 is a wasteful number, since it uses less digits than its factorization.

478338911999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36795300936.

The product of its digits is 105815808, while the sum is 71.

The spelling of 478338911999 in words is "four hundred seventy-eight billion, three hundred thirty-eight million, nine hundred eleven thousand, nine hundred ninety-nine".