12661011 has 48 divisors (see below), whose sum is σ = 21565440. Its totient is φ = 7076160.

The previous prime is 12660997. The next prime is 12661021. The reversal of 12661011 is 11016621.

12661011 is a `hidden beast` number, since 1 + 2 + 661 + 0 + 1 + 1 = 666.

It is not a de Polignac number, because 12661011 - 2⁵ = 12660979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12661021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99630 + ... + 99756.

It is an arithmetic number, because the mean of its divisors is an integer number (449280).

Almost surely, 2^12661011 is an apocalyptic number.

12661011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12661011 is a deficient number, since it is larger than the sum of its proper divisors (8904429).

12661011 is a wasteful number, since it uses less digits than its factorization.

12661011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 12661011 is about 3558.2314427254. The cubic root of 12661011 is about 233.0716560786.

Adding to 12661011 its reverse (11016621), we get a palindrome (23677632).

It can be divided in two parts, 126610 and 11, that added together give a palindrome (126621).

The spelling of 12661011 in words is "twelve million, six hundred sixty-one thousand, eleven".