12661650 has 96 divisors (see below), whose sum is σ = 35622720. Its totient is φ = 3306240.

The previous prime is 12661637. The next prime is 12661667. The reversal of 12661650 is 5616621.

It is a happy number.

12661650 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 1 + 650 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111994 + ... + 112106.

It is an arithmetic number, because the mean of its divisors is an integer number (371070).

Almost surely, 2^12661650 is an apocalyptic number.

12661650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12661650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17811360).

12661650 is an abundant number, since it is smaller than the sum of its proper divisors (22961070).

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

12661650 is a wasteful number, since it uses less digits than its factorization.

12661650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12661650 is about 3558.3212333908. The cubic root of 12661650 is about 233.0755770473.

It can be divided in two parts, 1266 and 1650, that added together give a square (2916 = 54²).

The spelling of 12661650 in words is "twelve million, six hundred sixty-one thousand, six hundred fifty".