18381780216036 has 48 divisors (see below), whose sum is σ = 48555645868800. Its totient is φ = 6011651389536.

The previous prime is 18381780216029. The next prime is 18381780216157. The reversal of 18381780216036 is 63061208718381.

It is a happy number.

18381780216036 is a `hidden beast` number, since 1 + 8 + 3 + 8 + 1 + 7 + 8 + 0 + 21 + 603 + 6 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1605670396 + ... + 1605681843.

It is an arithmetic number, because the mean of its divisors is an integer number (1011575955600).

Almost surely, 2^{18381780216036} is an apocalyptic number.

It is an amenable number.

18381780216036 is an abundant number, since it is smaller than the sum of its proper divisors (30173865652764).

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

18381780216036 is a wasteful number, since it uses less digits than its factorization.

18381780216036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211352305 (or 3211352297 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 18381780216036 in words is "eighteen trillion, three hundred eighty-one billion, seven hundred eighty million, two hundred sixteen thousand, thirty-six".