1816200386109 has 24 divisors (see below), whose sum is σ = 2814376088160. Its totient is φ = 1169048519856.

The previous prime is 1816200386087. The next prime is 1816200386131. The reversal of 1816200386109 is 9016830026181.

1816200386109 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 20 + 0 + 3 + 8 + 610 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (1816200386087) and next prime (1816200386131).

It is not a de Polignac number, because 1816200386109 - 2¹⁶ = 1816200320573 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816200386009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128856327 + ... + 128870420.

It is an arithmetic number, because the mean of its divisors is an integer number (117265670340).

Almost surely, 2^{1816200386109} is an apocalyptic number.

It is an amenable number.

1816200386109 is a deficient number, since it is larger than the sum of its proper divisors (998175702051).

1816200386109 is an equidigital number, since it uses as much as digits as its factorization.

1816200386109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257726791 (or 257726779 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 1816200386109 in words is "one trillion, eight hundred sixteen billion, two hundred million, three hundred eighty-six thousand, one hundred nine".