201818170340844 has 24 divisors (see below), whose sum is σ = 472423241192448. Its totient is φ = 67056412437840.

The previous prime is 201818170340821. The next prime is 201818170340869. The reversal of 201818170340844 is 448043071818102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27038872252 + ... + 27038879715.

It is an arithmetic number, because the mean of its divisors is an integer number (19684301716352).

Almost surely, 2^{201818170340844} is an apocalyptic number.

It is an amenable number.

201818170340844 is an abundant number, since it is smaller than the sum of its proper divisors (270605070851604).

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

201818170340844 is a wasteful number, since it uses less digits than its factorization.

201818170340844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54077752285 (or 54077752283 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 51.

The spelling of 201818170340844 in words is "two hundred one trillion, eight hundred eighteen billion, one hundred seventy million, three hundred forty thousand, eight hundred forty-four".