12347108981549 has 4 divisors (see below), whose sum is σ = 12437233864764. Its totient is φ = 12256984098336.

The previous prime is 12347108981497. The next prime is 12347108981573. The reversal of 12347108981549 is 94518980174321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5970726459049 + 6376382522500 = 2443507^2 + 2525150^2 .

It is a cyclic number.

It is not a de Polignac number, because 12347108981549 - 2²⁴ = 12347092204333 is a prime.

It is a super-2 number, since 2×12347108981549² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12347108981491 and 12347108981500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12347108986549) 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, 45062441402 + ... + 45062441675.

It is an arithmetic number, because the mean of its divisors is an integer number (3109308466191).

Almost surely, 2^{12347108981549} is an apocalyptic number.

It is an amenable number.

12347108981549 is a deficient number, since it is larger than the sum of its proper divisors (90124883215).

12347108981549 is an equidigital number, since it uses as much as digits as its factorization.

12347108981549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90124883214.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 12347108981549 in words is "twelve trillion, three hundred forty-seven billion, one hundred eight million, nine hundred eighty-one thousand, five hundred forty-nine".