12161661 has 8 divisors (see below), whose sum is σ = 16444224. Its totient is φ = 7993440.

The previous prime is 12161651. The next prime is 12161663. The reversal of 12161661 is 16616121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12161661 - 2⁵ = 12161629 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28336 + ... + 28761.

It is an arithmetic number, because the mean of its divisors is an integer number (2055528).

Almost surely, 2^12161661 is an apocalyptic number.

It is an amenable number.

12161661 is a deficient number, since it is larger than the sum of its proper divisors (4282563).

12161661 is an equidigital number, since it uses as much as digits as its factorization.

12161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57171.

The product of its digits is 432, while the sum is 24.

The square root of 12161661 is about 3487.3573089089. The cubic root of 12161661 is about 229.9663529860.

Adding to 12161661 its reverse (16616121), we get a palindrome (28777782).

The spelling of 12161661 in words is "twelve million, one hundred sixty-one thousand, six hundred sixty-one".