12198636577 has 4 divisors (see below), whose sum is σ = 12215279380. Its totient is φ = 12181993776.

The previous prime is 12198636521. The next prime is 12198636599. The reversal of 12198636577 is 77563689121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77563689121 = 179 ⋅433316699.

It can be written as a sum of positive squares in 2 ways, for example, as 10856806416 + 1341830161 = 104196^2 + 36631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12198636577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12198636517) 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, 8320302 + ... + 8321767.

It is an arithmetic number, because the mean of its divisors is an integer number (3053819845).

Almost surely, 2^12198636577 is an apocalyptic number.

It is an amenable number.

12198636577 is a deficient number, since it is larger than the sum of its proper divisors (16642803).

12198636577 is an equidigital number, since it uses as much as digits as its factorization.

12198636577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16642802.

The product of its digits is 3810240, while the sum is 55.

The spelling of 12198636577 in words is "twelve billion, one hundred ninety-eight million, six hundred thirty-six thousand, five hundred seventy-seven".