12316035521661 has 4 divisors (see below), whose sum is σ = 16421380695552. Its totient is φ = 8210690347772.

The previous prime is 12316035521651. The next prime is 12316035521689. The reversal of 12316035521661 is 16612553061321.

It is a happy number.

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 12316035521661 - 2¹⁹ = 12316034997373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12316035521641) 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, 2052672586941 + ... + 2052672586946.

It is an arithmetic number, because the mean of its divisors is an integer number (4105345173888).

Almost surely, 2^{12316035521661} is an apocalyptic number.

It is an amenable number.

12316035521661 is a deficient number, since it is larger than the sum of its proper divisors (4105345173891).

12316035521661 is an equidigital number, since it uses as much as digits as its factorization.

12316035521661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105345173890.

The product of its (nonzero) digits is 194400, while the sum is 42.

Adding to 12316035521661 its reverse (16612553061321), we get a palindrome (28928588582982).

The spelling of 12316035521661 in words is "twelve trillion, three hundred sixteen billion, thirty-five million, five hundred twenty-one thousand, six hundred sixty-one".