478891681919 has 6 divisors (see below), whose sum is σ = 557078079024. Its totient is φ = 410478584460.

The previous prime is 478891681913. The next prime is 478891681949. The reversal of 478891681919 is 919186198874.

It is not a de Polignac number, because 478891681919 - 2²⁰ = 478890633343 is a prime.

It is a super-2 number, since 2×478891681919² (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 (478891681913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4886649767 + ... + 4886649864.

It is an arithmetic number, because the mean of its divisors is an integer number (92846346504).

Almost surely, 2^478891681919 is an apocalyptic number.

478891681919 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

478891681919 is a deficient number, since it is larger than the sum of its proper divisors (78186397105).

478891681919 is an equidigital number, since it uses as much as digits as its factorization.

478891681919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9773299645 (or 9773299638 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 71.

The spelling of 478891681919 in words is "four hundred seventy-eight billion, eight hundred ninety-one million, six hundred eighty-one thousand, nine hundred nineteen".