1801921741018 has 48 divisors (see below), whose sum is σ = 3220099772904. Its totient is φ = 753820784640.

The previous prime is 1801921740979. The next prime is 1801921741019. The reversal of 1801921741018 is 8101471291081.

It can be written as a sum of positive squares in 4 ways, for example, as 1314065590929 + 487856150089 = 1146327^2 + 698467^2 .

It is not an unprimeable number, because it can be changed into a prime (1801921741019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 604393 + ... + 1992268.

Almost surely, 2^{1801921741018} is an apocalyptic number.

1801921741018 is a deficient number, since it is larger than the sum of its proper divisors (1418178031886).

1801921741018 is a wasteful number, since it uses less digits than its factorization.

1801921741018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596847 (or 2596840 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 43.

The spelling of 1801921741018 in words is "one trillion, eight hundred one billion, nine hundred twenty-one million, seven hundred forty-one thousand, eighteen".