2211655888 has 80 divisors (see below), whose sum is σ = 4722978960. Its totient is φ = 997097472.

The previous prime is 2211655877. The next prime is 2211655891. The reversal of 2211655888 is 8885561122.

It can be written as a sum of positive squares in 8 ways, for example, as 218211984 + 1993443904 = 14772^2 + 44648^2 .

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1715148 + ... + 1716436.

It is an arithmetic number, because the mean of its divisors is an integer number (59037237).

Almost surely, 2^2211655888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2211655888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2361489480).

2211655888 is an abundant number, since it is smaller than the sum of its proper divisors (2511323072).

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

2211655888 is a wasteful number, since it uses less digits than its factorization.

2211655888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496 (or 1490 counting only the distinct ones).

The product of its digits is 307200, while the sum is 46.

The square root of 2211655888 is about 47028.2456402533. The cubic root of 2211655888 is about 1302.8843035695.

The spelling of 2211655888 in words is "two billion, two hundred eleven million, six hundred fifty-five thousand, eight hundred eighty-eight".