12181655250313 has 4 divisors (see below), whose sum is σ = 12601712327940. Its totient is φ = 11761598172688.

The previous prime is 12181655250301. The next prime is 12181655250451. The reversal of 12181655250313 is 31305255618121.

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 4911152396544 + 7270502853769 = 2216112^2 + 2696387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12181655250313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12181655250313.

It is not an unprimeable number, because it can be changed into a prime (12181655250013) 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, 210028538770 + ... + 210028538827.

It is an arithmetic number, because the mean of its divisors is an integer number (3150428081985).

Almost surely, 2^{12181655250313} is an apocalyptic number.

It is an amenable number.

12181655250313 is a deficient number, since it is larger than the sum of its proper divisors (420057077627).

12181655250313 is an equidigital number, since it uses as much as digits as its factorization.

12181655250313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420057077626.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 12181655250313 in words is "twelve trillion, one hundred eighty-one billion, six hundred fifty-five million, two hundred fifty thousand, three hundred thirteen".