1812221501760 has 840 divisors, whose sum is σ = 6837079616136. Its totient is φ = 455571578880.

The previous prime is 1812221501737. The next prime is 1812221501803. The reversal of 1812221501760 is 671051222181.

It is a happy number.

1812221501760 is a `hidden beast` number, since 1 + 8 + 122 + 21 + 501 + 7 + 6 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 850143009024 + 962078492736 = 922032^2 + 980856^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 119 ways as a sum of consecutive naturals, for example, 2741635830 + ... + 2741636490.

Almost surely, 2^{1812221501760} is an apocalyptic number.

1812221501760 is a gapful number since it is divisible by the number (10) 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 1812221501760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3418539808068).

1812221501760 is an abundant number, since it is smaller than the sum of its proper divisors (5024858114376).

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

1812221501760 is a wasteful number, since it uses less digits than its factorization.

1812221501760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021 (or 983 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The spelling of 1812221501760 in words is "one trillion, eight hundred twelve billion, two hundred twenty-one million, five hundred one thousand, seven hundred sixty".