1809996138612 has 18 divisors (see below), whose sum is σ = 4575268017138. Its totient is φ = 603332046192.

The previous prime is 1809996138593. The next prime is 1809996138623. The reversal of 1809996138612 is 2168316999081.

1809996138612 is a `hidden beast` number, since 1 + 8 + 0 + 9 + 9 + 9 + 6 + 1 + 3 + 8 + 612 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1159269969636 + 650726168976 = 1076694^2 + 806676^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1809996138612.

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 5 ways as a sum of consecutive naturals, for example, 25138835223 + ... + 25138835294.

Almost surely, 2^{1809996138612} is an apocalyptic number.

1809996138612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1809996138612 is an abundant number, since it is smaller than the sum of its proper divisors (2765271878526).

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

1809996138612 is a wasteful number, since it uses less digits than its factorization.

1809996138612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50277670527 (or 50277670522 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The spelling of 1809996138612 in words is "one trillion, eight hundred nine billion, nine hundred ninety-six million, one hundred thirty-eight thousand, six hundred twelve".