1818822656 has 144 divisors (see below), whose sum is σ = 4425220800. Its totient is φ = 731971584.

The previous prime is 1818822641. The next prime is 1818822659. The reversal of 1818822656 is 6562288181.

It is a self number, because there is not a number n which added to its sum of digits gives 1818822656.

It is not an unprimeable number, because it can be changed into a prime (1818822659) 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, 4142885 + ... + 4143323.

It is an arithmetic number, because the mean of its divisors is an integer number (30730700).

Almost surely, 2^1818822656 is an apocalyptic number.

1818822656 is a gapful number since it is divisible by the number (16) 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 1818822656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2212610400).

1818822656 is an abundant number, since it is smaller than the sum of its proper divisors (2606398144).

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

1818822656 is an equidigital number, since it uses as much as digits as its factorization.

1818822656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 465 counting only the distinct ones).

The product of its digits is 368640, while the sum is 47.

The square root of 1818822656 is about 42647.6570986027. The cubic root of 1818822656 is about 1220.6658230656.

The spelling of 1818822656 in words is "one billion, eight hundred eighteen million, eight hundred twenty-two thousand, six hundred fifty-six".