222561660 has 96 divisors (see below), whose sum is σ = 662276160. Its totient is φ = 55738368.

The previous prime is 222561643. The next prime is 222561701. The reversal of 222561660 is 66165222.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62652 + ... + 66108.

It is an arithmetic number, because the mean of its divisors is an integer number (6898710).

Almost surely, 2^222561660 is an apocalyptic number.

222561660 is a gapful number since it is divisible by the number (20) 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 222561660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331138080).

222561660 is an abundant number, since it is smaller than the sum of its proper divisors (439714500).

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

222561660 is a wasteful number, since it uses less digits than its factorization.

222561660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535 (or 3533 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 222561660 is about 14918.5005948989. The cubic root of 222561660 is about 606.0151070747.

The spelling of 222561660 in words is "two hundred twenty-two million, five hundred sixty-one thousand, six hundred sixty".