6618781260 has 576 divisors, whose sum is σ = 25914749952. Its totient is φ = 1330255872.

The previous prime is 6618781243. The next prime is 6618781261. The reversal of 6618781260 is 621878166.

It is a happy number.

6618781260 is a `hidden beast` number, since 6 + 618 + 7 + 8 + 1 + 26 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (6618781261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 40605939 + ... + 40606101.

Almost surely, 2^6618781260 is an apocalyptic number.

6618781260 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6618781260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12957374976).

6618781260 is an abundant number, since it is smaller than the sum of its proper divisors (19295968692).

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

6618781260 is a wasteful number, since it uses less digits than its factorization.

6618781260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 6618781260 is about 81355.8925954353. The cubic root of 6618781260 is about 1877.5550361733. Note that the first 3 decimals are identical.

The spelling of 6618781260 in words is "six billion, six hundred eighteen million, seven hundred eighty-one thousand, two hundred sixty".