12017818661 has 4 divisors (see below), whose sum is σ = 12027186912. Its totient is φ = 12008450412.

The previous prime is 12017818597. The next prime is 12017818733. The reversal of 12017818661 is 16681871021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12017818661 - 2⁶ = 12017818597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12017814661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4682201 + ... + 4684766.

It is an arithmetic number, because the mean of its divisors is an integer number (3006796728).

Almost surely, 2^12017818661 is an apocalyptic number.

It is an amenable number.

12017818661 is a deficient number, since it is larger than the sum of its proper divisors (9368251).

12017818661 is an equidigital number, since it uses as much as digits as its factorization.

12017818661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9368250.

The product of its (nonzero) digits is 32256, while the sum is 41.

The spelling of 12017818661 in words is "twelve billion, seventeen million, eight hundred eighteen thousand, six hundred sixty-one".