1806985484161 has 32 divisors (see below), whose sum is σ = 2174310770688. Its totient is φ = 1479809835840.

The previous prime is 1806985484159. The next prime is 1806985484201. The reversal of 1806985484161 is 1614845896081.

It is a cyclic number.

It is not a de Polignac number, because 1806985484161 - 2¹ = 1806985484159 is a prime.

It is a super-3 number, since 3×1806985484161³ (a number of 38 digits) contains 333 as substring.

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 1806985484161.

It is not an unprimeable number, because it can be changed into a prime (1806985484861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1944786 + ... + 2719588.

It is an arithmetic number, because the mean of its divisors is an integer number (67947211584).

Almost surely, 2^{1806985484161} is an apocalyptic number.

1806985484161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1806985484161 is a deficient number, since it is larger than the sum of its proper divisors (367325286527).

1806985484161 is a wasteful number, since it uses less digits than its factorization.

1806985484161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775221.

The product of its (nonzero) digits is 13271040, while the sum is 61.

The spelling of 1806985484161 in words is "one trillion, eight hundred six billion, nine hundred eighty-five million, four hundred eighty-four thousand, one hundred sixty-one".