1801236321081 has 12 divisors (see below), whose sum is σ = 2627546053860. Its totient is φ = 1188934864800.

The previous prime is 1801236320999. The next prime is 1801236321097.

1801236321081 is a `hidden beast` number, since 1 + 8 + 0 + 1 + 2 + 3 + 632 + 10 + 8 + 1 = 666.

1801236321081 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 1604632761081 + 196603560000 = 1266741^2 + 443400^2 .

It is not a de Polignac number, because 1801236321081 - 2⁷ = 1801236320953 is a prime.

It is a super-2 number, since 2×1801236321081² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1801236321581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 990778146 + ... + 990779963.

It is an arithmetic number, because the mean of its divisors is an integer number (218962171155).

Almost surely, 2^{1801236321081} is an apocalyptic number.

It is an amenable number.

1801236321081 is a deficient number, since it is larger than the sum of its proper divisors (826309732779).

1801236321081 is a wasteful number, since it uses less digits than its factorization.

1801236321081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981558216 (or 1981558213 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 1801236321081 in words is "one trillion, eight hundred one billion, two hundred thirty-six million, three hundred twenty-one thousand, eighty-one".