1818166135500 has 2880 divisors, whose sum is σ = 7799551119360. Its totient is φ = 363916800000.

The previous prime is 1818166135477. The next prime is 1818166135537. The reversal of 1818166135500 is 55316618181.

It is a happy number.

1818166135500 is a `hidden beast` number, since 1 + 8 + 1 + 8 + 1 + 6 + 6 + 135 + 500 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 959 ways as a sum of consecutive naturals, for example, 44345515480 + ... + 44345515520.

It is an arithmetic number, because the mean of its divisors is an integer number (2708177472).

Almost surely, 2^{1818166135500} is an apocalyptic number.

1818166135500 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 1818166135500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3899775559680).

1818166135500 is an abundant number, since it is smaller than the sum of its proper divisors (5981384983860).

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

1818166135500 is a wasteful number, since it uses less digits than its factorization.

1818166135500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 1818166135500 in words is "one trillion, eight hundred eighteen billion, one hundred sixty-six million, one hundred thirty-five thousand, five hundred".