1801981838196 has 72 divisors (see below), whose sum is σ = 4575951099720. Its totient is φ = 597900312576.

The previous prime is 1801981838071. The next prime is 1801981838227. The reversal of 1801981838196 is 6918381891081.

1801981838196 is a `hidden beast` number, since 1 + 80 + 1 + 98 + 1 + 8 + 381 + 96 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 328948131600 + 1473033706596 = 573540^2 + 1213686^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39688660 + ... + 39734036.

It is an arithmetic number, because the mean of its divisors is an integer number (63554876385).

Almost surely, 2^{1801981838196} is an apocalyptic number.

It is an amenable number.

1801981838196 is an abundant number, since it is smaller than the sum of its proper divisors (2773969261524).

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

1801981838196 is a wasteful number, since it uses less digits than its factorization.

1801981838196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50433 (or 50428 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 63.

The spelling of 1801981838196 in words is "one trillion, eight hundred one billion, nine hundred eighty-one million, eight hundred thirty-eight thousand, one hundred ninety-six".