12805549418 has 8 divisors (see below), whose sum is σ = 19398505860. Its totient is φ = 6339380800.

The previous prime is 12805549417. The next prime is 12805549423. The reversal of 12805549418 is 81494550821.

It can be written as a sum of positive squares in 2 ways, for example, as 12752507329 + 53042089 = 112927^2 + 7283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12805549411) 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, 31696703 + ... + 31697106.

Almost surely, 2^12805549418 is an apocalyptic number.

12805549418 is a deficient number, since it is larger than the sum of its proper divisors (6592956442).

12805549418 is a wasteful number, since it uses less digits than its factorization.

12805549418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63393912.

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 12805549418 in words is "twelve billion, eight hundred five million, five hundred forty-nine thousand, four hundred eighteen".