6619863680 has 96 divisors (see below), whose sum is σ = 16544443860. Its totient is φ = 2532687872.

The previous prime is 6619863671. The next prime is 6619863683. The reversal of 6619863680 is 863689166.

It can be written as a sum of positive squares in 2 ways, for example, as 6524762176 + 95101504 = 80776^2 + 9752^2 .

It is not an unprimeable number, because it can be changed into a prime (6619863683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328784 + ... + 348336.

Almost surely, 2^6619863680 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 6619863680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8272221930).

6619863680 is an abundant number, since it is smaller than the sum of its proper divisors (9924580180).

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

6619863680 is a wasteful number, since it uses less digits than its factorization.

6619863680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19618 (or 19583 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 53.

The square root of 6619863680 is about 81362.5446996344. The cubic root of 6619863680 is about 1877.6573809135.

The spelling of 6619863680 in words is "six billion, six hundred nineteen million, eight hundred sixty-three thousand, six hundred eighty".