1801802138868 has 36 divisors (see below), whose sum is σ = 4596340328580. Its totient is φ = 595090613376.

The previous prime is 1801802138849. The next prime is 1801802138893. The reversal of 1801802138868 is 8688312081081.

1801802138868 is a `hidden beast` number, since 1 + 8 + 0 + 180 + 21 + 388 + 68 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1222090452324 + 579711686544 = 1105482^2 + 761388^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229583505 + ... + 229591352.

Almost surely, 2^{1801802138868} is an apocalyptic number.

1801802138868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1801802138868 is an abundant number, since it is smaller than the sum of its proper divisors (2794538189712).

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

1801802138868 is a wasteful number, since it uses less digits than its factorization.

1801802138868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459174976 (or 459174971 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 54.

The spelling of 1801802138868 in words is "one trillion, eight hundred one billion, eight hundred two million, one hundred thirty-eight thousand, eight hundred sixty-eight".