12161660 has 24 divisors (see below), whose sum is σ = 29188320. Its totient is φ = 4169664.

The previous prime is 12161651. The next prime is 12161663. The reversal of 12161660 is 6616121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12161663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43295 + ... + 43574.

It is an arithmetic number, because the mean of its divisors is an integer number (1216180).

Almost surely, 2^12161660 is an apocalyptic number.

12161660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12161660 is an abundant number, since it is smaller than the sum of its proper divisors (17026660).

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

12161660 is a wasteful number, since it uses less digits than its factorization.

12161660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86885 (or 86883 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 12161660 is about 3487.3571655338. The cubic root of 12161660 is about 229.9663466829.

Adding to 12161660 its reverse (6616121), we get a palindrome (18777781).

It can be divided in two parts, 12161 and 660, that added together give a palindrome (12821).

The spelling of 12161660 in words is "twelve million, one hundred sixty-one thousand, six hundred sixty".