12181854492001 has 4 divisors (see below), whose sum is σ = 12244972909252. Its totient is φ = 12118736074752.

The previous prime is 12181854491981. The next prime is 12181854492043. The reversal of 12181854492001 is 10029445818121.

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 5308669443025 + 6873185048976 = 2304055^2 + 2621676^2 .

It is a cyclic number.

It is not a de Polignac number, because 12181854492001 - 2²³ = 12181846103393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12181854492091) 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, 31559208336 + ... + 31559208721.

It is an arithmetic number, because the mean of its divisors is an integer number (3061243227313).

Almost surely, 2^{12181854492001} is an apocalyptic number.

It is an amenable number.

12181854492001 is a deficient number, since it is larger than the sum of its proper divisors (63118417251).

12181854492001 is an equidigital number, since it uses as much as digits as its factorization.

12181854492001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63118417250.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 12181854492001 in words is "twelve trillion, one hundred eighty-one billion, eight hundred fifty-four million, four hundred ninety-two thousand, one".