12641509561 has 8 divisors (see below), whose sum is σ = 13178504448. Its totient is φ = 12112590000.

The previous prime is 12641509501. The next prime is 12641509579. The reversal of 12641509561 is 16590514621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12641509561 - 2²³ = 12633120953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12641509501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2015635 + ... + 2021896.

It is an arithmetic number, because the mean of its divisors is an integer number (1647313056).

Almost surely, 2^12641509561 is an apocalyptic number.

It is an amenable number.

12641509561 is a deficient number, since it is larger than the sum of its proper divisors (536994887).

12641509561 is a wasteful number, since it uses less digits than its factorization.

12641509561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037663.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 12641509561 in words is "twelve billion, six hundred forty-one million, five hundred nine thousand, five hundred sixty-one".