12071436661 has 4 divisors (see below), whose sum is σ = 12074511424. Its totient is φ = 12068361900.

The previous prime is 12071436659. The next prime is 12071436667. The reversal of 12071436661 is 16663417021.

12071436661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12071436661 - 2¹ = 12071436659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12071436661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12071436667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531485 + ... + 1539346.

It is an arithmetic number, because the mean of its divisors is an integer number (3018627856).

Almost surely, 2^12071436661 is an apocalyptic number.

It is an amenable number.

12071436661 is a deficient number, since it is larger than the sum of its proper divisors (3074763).

12071436661 is an equidigital number, since it uses as much as digits as its factorization.

12071436661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074762.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 12071436661 in words is "twelve billion, seventy-one million, four hundred thirty-six thousand, six hundred sixty-one".