12326620561 has 4 divisors (see below), whose sum is σ = 12331210752. Its totient is φ = 12322030372.

The previous prime is 12326620543. The next prime is 12326620573. The reversal of 12326620561 is 16502662321.

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 12326620561 - 2¹³ = 12326612369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12326620531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2291065 + ... + 2296438.

It is an arithmetic number, because the mean of its divisors is an integer number (3082802688).

Almost surely, 2^12326620561 is an apocalyptic number.

It is an amenable number.

12326620561 is a deficient number, since it is larger than the sum of its proper divisors (4590191).

12326620561 is an equidigital number, since it uses as much as digits as its factorization.

12326620561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4590190.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 12326620561 in words is "twelve billion, three hundred twenty-six million, six hundred twenty thousand, five hundred sixty-one".