12201660 has 72 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 3189888.

The previous prime is 12201659. The next prime is 12201671. The reversal of 12201660 is 6610221.

It is a happy number.

12201660 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 1 + 660 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8901 + ... + 10179.

It is an arithmetic number, because the mean of its divisors is an integer number (524160).

Almost surely, 2^12201660 is an apocalyptic number.

12201660 is a gapful number since it is divisible by the number (10) 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 12201660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18869760).

12201660 is an abundant number, since it is smaller than the sum of its proper divisors (25537860).

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

12201660 is a wasteful number, since it uses less digits than its factorization.

12201660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12201660 is about 3493.0874595406. The cubic root of 12201660 is about 230.2181924394.

Adding to 12201660 its reverse (6610221), we get a palindrome (18811881).

The spelling of 12201660 in words is "twelve million, two hundred one thousand, six hundred sixty".