201217998785811 has 64 divisors (see below), whose sum is σ = 314085081600000. Its totient is φ = 114537286770816.

The previous prime is 201217998785777. The next prime is 201217998785857. The reversal of 201217998785811 is 118587899712102.

201217998785811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201217998785811 - 2²² = 201217994591507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201217998785311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2000944150 + ... + 2001044708.

It is an arithmetic number, because the mean of its divisors is an integer number (4907579400000).

Almost surely, 2^{201217998785811} is an apocalyptic number.

201217998785811 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

201217998785811 is a deficient number, since it is larger than the sum of its proper divisors (112867082814189).

201217998785811 is a wasteful number, since it uses less digits than its factorization.

201217998785811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108081 (or 108067 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 69.

The spelling of 201217998785811 in words is "two hundred one trillion, two hundred seventeen billion, nine hundred ninety-eight million, seven hundred eighty-five thousand, eight hundred eleven".