2218690656 has 192 divisors, whose sum is σ = 7964812800. Its totient is φ = 585128448.

The previous prime is 2218690631. The next prime is 2218690657. The reversal of 2218690656 is 6560968122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218690657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64515 + ... + 92733.

It is an arithmetic number, because the mean of its divisors is an integer number (41483400).

Almost surely, 2^2218690656 is an apocalyptic number.

2218690656 is a gapful number since it is divisible by the number (26) 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 2218690656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3982406400).

2218690656 is an abundant number, since it is smaller than the sum of its proper divisors (5746122144).

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

2218690656 is a wasteful number, since it uses less digits than its factorization.

2218690656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28258 (or 28244 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 2218690656 is about 47102.9792688318. The cubic root of 2218690656 is about 1304.2642331541.

The spelling of 2218690656 in words is "two billion, two hundred eighteen million, six hundred ninety thousand, six hundred fifty-six".