18440771781140 has 12 divisors (see below), whose sum is σ = 38725620740436. Its totient is φ = 7376308712448.

The previous prime is 18440771781139. The next prime is 18440771781167. The reversal of 18440771781140 is 4118717704481.

It can be written as a sum of positive squares in 2 ways, for example, as 13526418797584 + 4914352983556 = 3677828^2 + 2216834^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461019294509 + ... + 461019294548.

It is an arithmetic number, because the mean of its divisors is an integer number (3227135061703).

Almost surely, 2^{18440771781140} is an apocalyptic number.

18440771781140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18440771781140 is an abundant number, since it is smaller than the sum of its proper divisors (20284848959296).

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

18440771781140 is a wasteful number, since it uses less digits than its factorization.

18440771781140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922038589066 (or 922038589064 counting only the distinct ones).

The product of its (nonzero) digits is 1404928, while the sum is 53.

The spelling of 18440771781140 in words is "eighteen trillion, four hundred forty billion, seven hundred seventy-one million, seven hundred eighty-one thousand, one hundred forty".