6646478344 has 16 divisors (see below), whose sum is σ = 13595069520. Its totient is φ = 3021126480.

The previous prime is 6646478339. The next prime is 6646478353. The reversal of 6646478344 is 4438746466.

It is a junction number, because it is equal to n+sod(n) for n = 6646478291 and 6646478300.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37763994 + ... + 37764169.

It is an arithmetic number, because the mean of its divisors is an integer number (849691845).

Almost surely, 2^6646478344 is an apocalyptic number.

It is an amenable number.

6646478344 is an abundant number, since it is smaller than the sum of its proper divisors (6948591176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6646478344 is a wasteful number, since it uses less digits than its factorization.

6646478344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75528180 (or 75528176 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 52.

The square root of 6646478344 is about 81525.9366336873. The cubic root of 6646478344 is about 1880.1703429475.

The spelling of 6646478344 in words is "six billion, six hundred forty-six million, four hundred seventy-eight thousand, three hundred forty-four".