6218661812 has 24 divisors (see below), whose sum is σ = 12570344640. Its totient is φ = 2660389760.

The previous prime is 6218661781. The next prime is 6218661821. The reversal of 6218661812 is 2181668126.

It is a self number, because there is not a number n which added to its sum of digits gives 6218661812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4156112 + ... + 4157607.

It is an arithmetic number, because the mean of its divisors is an integer number (523764360).

Almost surely, 2^6218661812 is an apocalyptic number.

It is an amenable number.

6218661812 is an abundant number, since it is smaller than the sum of its proper divisors (6351682828).

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

6218661812 is a wasteful number, since it uses less digits than its factorization.

6218661812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8313751 (or 8313749 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 6218661812 is about 78858.4923264451. The cubic root of 6218661812 is about 1838.9318993962.

The spelling of 6218661812 in words is "six billion, two hundred eighteen million, six hundred sixty-one thousand, eight hundred twelve".