6646745456 has 40 divisors (see below), whose sum is σ = 13919984064. Its totient is φ = 3056382720.

The previous prime is 6646745449. The next prime is 6646745513. The reversal of 6646745456 is 6545476466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6646745398 and 6646745407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2591 + ... + 115326.

Almost surely, 2^6646745456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646745456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6959992032).

6646745456 is an abundant number, since it is smaller than the sum of its proper divisors (7273238608).

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

6646745456 is a wasteful number, since it uses less digits than its factorization.

6646745456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118209 (or 118203 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 53.

The square root of 6646745456 is about 81527.5748198117. The cubic root of 6646745456 is about 1880.1955296858.

The spelling of 6646745456 in words is "six billion, six hundred forty-six million, seven hundred forty-five thousand, four hundred fifty-six".