12055600661 has 4 divisors (see below), whose sum is σ = 12982954572. Its totient is φ = 11128246752.

The previous prime is 12055600619. The next prime is 12055600699. The reversal of 12055600661 is 16600655021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 500640625 + 11554960036 = 22375^2 + 107494^2 .

It is a cyclic number.

It is not a de Polignac number, because 12055600661 - 2¹⁸ = 12055338517 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 (12055602661) 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, 463676936 + ... + 463676961.

It is an arithmetic number, because the mean of its divisors is an integer number (3245738643).

Almost surely, 2^12055600661 is an apocalyptic number.

It is an amenable number.

12055600661 is a deficient number, since it is larger than the sum of its proper divisors (927353911).

12055600661 is an equidigital number, since it uses as much as digits as its factorization.

12055600661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927353910.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 12055600661 in words is "twelve billion, fifty-five million, six hundred thousand, six hundred sixty-one".