1818223701840 has 360 divisors, whose sum is σ = 7649528789448. Its totient is φ = 383625123840.

The previous prime is 1818223701809. The next prime is 1818223701857. The reversal of 1818223701840 is 481073228181.

1818223701840 is a `hidden beast` number, since 1 + 81 + 8 + 22 + 370 + 184 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 225963326736 + 1592260375104 = 475356^2 + 1261848^2 .

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1523551 + ... + 2440830.

Almost surely, 2^{1818223701840} is an apocalyptic number.

1818223701840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818223701840 is an abundant number, since it is smaller than the sum of its proper divisors (5831305087608).

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

1818223701840 is a wasteful number, since it uses less digits than its factorization.

1818223701840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964427 (or 3964411 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 1818223701840 in words is "one trillion, eight hundred eighteen billion, two hundred twenty-three million, seven hundred one thousand, eight hundred forty".