12361906549 has 4 divisors (see below), whose sum is σ = 12760677760. Its totient is φ = 11963135340.

The previous prime is 12361906493. The next prime is 12361906553. The reversal of 12361906549 is 94560916321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94560916321 = 6053 ⋅15622157.

It is a cyclic number.

It is not a de Polignac number, because 12361906549 - 2¹⁵ = 12361873781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12361906499 and 12361906508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12361906049) 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, 199385559 + ... + 199385620.

It is an arithmetic number, because the mean of its divisors is an integer number (3190169440).

Almost surely, 2^12361906549 is an apocalyptic number.

It is an amenable number.

12361906549 is a deficient number, since it is larger than the sum of its proper divisors (398771211).

12361906549 is an equidigital number, since it uses as much as digits as its factorization.

12361906549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398771210.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 12361906549 in words is "twelve billion, three hundred sixty-one million, nine hundred six thousand, five hundred forty-nine".