6644785410 has 96 divisors (see below), whose sum is σ = 18310726512. Its totient is φ = 1666068480.

The previous prime is 6644785373. The next prime is 6644785421. The reversal of 6644785410 is 145874466.

6644785410 is a `hidden beast` number, since 6 + 64 + 47 + 8 + 541 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 4367491569 + 2277293841 = 66087^2 + 47721^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2533900 + ... + 2536520.

Almost surely, 2^6644785410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6644785410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9155363256).

6644785410 is an abundant number, since it is smaller than the sum of its proper divisors (11665941102).

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

6644785410 is a wasteful number, since it uses less digits than its factorization.

6644785410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308 (or 4305 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 6644785410 is about 81515.5531785193. The cubic root of 6644785410 is about 1880.0106957668.

The spelling of 6644785410 in words is "six billion, six hundred forty-four million, seven hundred eighty-five thousand, four hundred ten".