181800001801836 has 192 divisors, whose sum is σ = 537163141939200. Its totient is φ = 52671447892800.

The previous prime is 181800001801811. The next prime is 181800001801841. The reversal of 181800001801836 is 638108100008181.

It is a super-2 number, since 2×181800001801836² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181800001801791 and 181800001801800.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26680996 + ... + 32794443.

It is an arithmetic number, because the mean of its divisors is an integer number (2797724697600).

Almost surely, 2^{181800001801836} is an apocalyptic number.

It is an amenable number.

181800001801836 is an abundant number, since it is smaller than the sum of its proper divisors (355363140137364).

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

181800001801836 is a wasteful number, since it uses less digits than its factorization.

181800001801836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59475577 (or 59475569 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The spelling of 181800001801836 in words is "one hundred eighty-one trillion, eight hundred billion, one million, eight hundred one thousand, eight hundred thirty-six".