1803681232145 has 8 divisors (see below), whose sum is σ = 2330911130856. Its totient is φ = 1331949217536.

The previous prime is 1803681232141. The next prime is 1803681232159. The reversal of 1803681232145 is 5412321863081.

It is a Cunningham number, because it is equal to 1343012²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 1803681232144 = 1^2 + 1343012^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1803681232145 - 2² = 1803681232141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1803681232096 and 1803681232105.

It is not an unprimeable number, because it can be changed into a prime (1803681232141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13874470952 + ... + 13874471081.

It is an arithmetic number, because the mean of its divisors is an integer number (291363891357).

Almost surely, 2^{1803681232145} is an apocalyptic number.

It is an amenable number.

1803681232145 is a deficient number, since it is larger than the sum of its proper divisors (527229898711).

1803681232145 is a wasteful number, since it uses less digits than its factorization.

1803681232145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27748942051.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 1803681232145 in words is "one trillion, eight hundred three billion, six hundred eighty-one million, two hundred thirty-two thousand, one hundred forty-five".