1808181901836 has 60 divisors (see below), whose sum is σ = 4739096522160. Its totient is φ = 601177831200.

The previous prime is 1808181901831. The next prime is 1808181901957. The reversal of 1808181901836 is 6381091818081.

It is a happy number.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1808181901831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7047240 + ... + 7299311.

It is an arithmetic number, because the mean of its divisors is an integer number (78984942036).

Almost surely, 2^{1808181901836} is an apocalyptic number.

It is an amenable number.

1808181901836 is an abundant number, since it is smaller than the sum of its proper divisors (2930914620324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1808181901836 is a wasteful number, since it uses less digits than its factorization.

1808181901836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14346956 (or 14346945 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 54.

The spelling of 1808181901836 in words is "one trillion, eight hundred eight billion, one hundred eighty-one million, nine hundred one thousand, eight hundred thirty-six".