6481732218 has 64 divisors (see below), whose sum is σ = 14138530560. Its totient is φ = 1969132032.

The previous prime is 6481732211. The next prime is 6481732241. The reversal of 6481732218 is 8122371846.

It is a self number, because there is not a number n which added to its sum of digits gives 6481732218.

It is not an unprimeable number, because it can be changed into a prime (6481732211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2103603 + ... + 2106681.

It is an arithmetic number, because the mean of its divisors is an integer number (220914540).

Almost surely, 2^6481732218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6481732218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7069265280).

6481732218 is an abundant number, since it is smaller than the sum of its proper divisors (7656798342).

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

6481732218 is a wasteful number, since it uses less digits than its factorization.

6481732218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431.

The product of its digits is 129024, while the sum is 42.

The square root of 6481732218 is about 80509.2057966044. The cubic root of 6481732218 is about 1864.5056123546.

The spelling of 6481732218 in words is "six billion, four hundred eighty-one million, seven hundred thirty-two thousand, two hundred eighteen".