12198958861 has 4 divisors (see below), whose sum is σ = 12215074492. Its totient is φ = 12182843232.

The previous prime is 12198958819. The next prime is 12198958883. The reversal of 12198958861 is 16885989121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16885989121 = 10487 ⋅1610183.

It can be written as a sum of positive squares in 2 ways, for example, as 7848896836 + 4350062025 = 88594^2 + 65955^2 .

It is a cyclic number.

It is not a de Polignac number, because 12198958861 - 2¹³ = 12198950669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12198958796 and 12198958805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12198958061) 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, 8056680 + ... + 8058193.

It is an arithmetic number, because the mean of its divisors is an integer number (3053768623).

Almost surely, 2^12198958861 is an apocalyptic number.

It is an amenable number.

12198958861 is a deficient number, since it is larger than the sum of its proper divisors (16115631).

12198958861 is an equidigital number, since it uses as much as digits as its factorization.

12198958861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16115630.

The product of its digits is 2488320, while the sum is 58.

The spelling of 12198958861 in words is "twelve billion, one hundred ninety-eight million, nine hundred fifty-eight thousand, eight hundred sixty-one".