1813443852161 has 8 divisors (see below), whose sum is σ = 1817484105864. Its totient is φ = 1809403914240.

The previous prime is 1813443852071. The next prime is 1813443852173. The reversal of 1813443852161 is 1612583443181.

It can be written as a sum of positive squares in 4 ways, for example, as 22046310400 + 1791397541761 = 148480^2 + 1338431^2 .

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 1813443852161 - 2¹⁰ = 1813443851137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813443852461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14338481 + ... + 14464401.

It is an arithmetic number, because the mean of its divisors is an integer number (227185513233).

Almost surely, 2^{1813443852161} is an apocalyptic number.

It is an amenable number.

1813443852161 is a deficient number, since it is larger than the sum of its proper divisors (4040253703).

1813443852161 is a wasteful number, since it uses less digits than its factorization.

1813443852161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157891.

The product of its digits is 552960, while the sum is 47.

The spelling of 1813443852161 in words is "one trillion, eight hundred thirteen billion, four hundred forty-three million, eight hundred fifty-two thousand, one hundred sixty-one".