1808938220544 has 1232 divisors, whose sum is σ = 6896114391040. Its totient is φ = 461155368960.

The previous prime is 1808938220539. The next prime is 1808938220633. The reversal of 1808938220544 is 4450228398081.

1808938220544 is a `hidden beast` number, since 1 + 8 + 0 + 8 + 93 + 8 + 2 + 2 + 0 + 544 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 2105864787 + ... + 2105865645.

Almost surely, 2^{1808938220544} is an apocalyptic number.

1808938220544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1808938220544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3448057195520).

1808938220544 is an abundant number, since it is smaller than the sum of its proper divisors (5087176170496).

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

1808938220544 is an equidigital number, since it uses as much as digits as its factorization.

1808938220544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 1808938220544 in words is "one trillion, eight hundred eight billion, nine hundred thirty-eight million, two hundred twenty thousand, five hundred forty-four".