1805436440064 has 120 divisors (see below), whose sum is σ = 5219744830872. Its totient is φ = 600757309440.

The previous prime is 1805436439997. The next prime is 1805436440069. The reversal of 1805436440064 is 4600446345081.

1805436440064 is a `hidden beast` number, since 1 + 8 + 0 + 543 + 6 + 4 + 40 + 0 + 64 = 666.

It is a super-2 number, since 2×1805436440064² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805436440069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2288082 + ... + 2974254.

Almost surely, 2^{1805436440064} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1805436440064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2609872415436).

1805436440064 is an abundant number, since it is smaller than the sum of its proper divisors (3414308390808).

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

1805436440064 is an equidigital number, since it uses as much as digits as its factorization.

1805436440064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686768 (or 686749 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 45.

The spelling of 1805436440064 in words is "one trillion, eight hundred five billion, four hundred thirty-six million, four hundred forty thousand, sixty-four".