1816518199536 has 60 divisors (see below), whose sum is σ = 5086517412288. Its totient is φ = 605173830912.

The previous prime is 1816518199477. The next prime is 1816518199567. The reversal of 1816518199536 is 6359918156181.

1816518199536 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 5 + 1 + 8 + 1 + 99 + 536 = 666.

It is a super-2 number, since 2×1816518199536² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3197365 + ... + 3722388.

Almost surely, 2^{1816518199536} is an apocalyptic number.

1816518199536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1816518199536 is an abundant number, since it is smaller than the sum of its proper divisors (3269999212752).

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

1816518199536 is a wasteful number, since it uses less digits than its factorization.

1816518199536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6921590 (or 6921581 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 63.

The spelling of 1816518199536 in words is "one trillion, eight hundred sixteen billion, five hundred eighteen million, one hundred ninety-nine thousand, five hundred thirty-six".