12661100 has 18 divisors (see below), whose sum is σ = 27474804. Its totient is φ = 5064400.

The previous prime is 12661097. The next prime is 12661123. The reversal of 12661100 is 116621.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63206 + ... + 63405.

It is an arithmetic number, because the mean of its divisors is an integer number (1526378).

Almost surely, 2^12661100 is an apocalyptic number.

12661100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12661100 is an abundant number, since it is smaller than the sum of its proper divisors (14813704).

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

12661100 is a wasteful number, since it uses less digits than its factorization.

12661100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126625 (or 126618 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12661100 is about 3558.2439489164. The cubic root of 12661100 is about 233.0722021995.

Adding to 12661100 its reverse (116621), we get a palindrome (12777721).

The spelling of 12661100 in words is "twelve million, six hundred sixty-one thousand, one hundred".