201811105881 has 256 divisors, whose sum is σ = 393654804480. Its totient is φ = 99164528640.

The previous prime is 201811105871. The next prime is 201811105901. The reversal of 201811105881 is 188501118102.

It is a happy number.

It is not a de Polignac number, because 201811105881 - 2⁹ = 201811105369 is a prime.

It is a super-2 number, since 2×201811105881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201811105841) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 466076241 + ... + 466076673.

It is an arithmetic number, because the mean of its divisors is an integer number (1537714080).

Almost surely, 2^201811105881 is an apocalyptic number.

201811105881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201811105881 is a deficient number, since it is larger than the sum of its proper divisors (191843698599).

201811105881 is a wasteful number, since it uses less digits than its factorization.

201811105881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 36.

The spelling of 201811105881 in words is "two hundred one billion, eight hundred eleven million, one hundred five thousand, eight hundred eighty-one".