12195097561 has 4 divisors (see below), whose sum is σ = 12306979300. Its totient is φ = 12083215824.

The previous prime is 12195097553. The next prime is 12195097573. The reversal of 12195097561 is 16579059121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16579059121 = 19 ⋅872582059.

It can be written as a sum of positive squares in 2 ways, for example, as 9671542336 + 2523555225 = 98344^2 + 50235^2 .

It is a cyclic number.

It is not a de Polignac number, because 12195097561 - 2³ = 12195097553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12195097511) 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, 55940706 + ... + 55940923.

It is an arithmetic number, because the mean of its divisors is an integer number (3076744825).

Almost surely, 2^12195097561 is an apocalyptic number.

It is an amenable number.

12195097561 is a deficient number, since it is larger than the sum of its proper divisors (111881739).

12195097561 is a wasteful number, since it uses less digits than its factorization.

12195097561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111881738.

The product of its (nonzero) digits is 170100, while the sum is 46.

The spelling of 12195097561 in words is "twelve billion, one hundred ninety-five million, ninety-seven thousand, five hundred sixty-one".