201561745041 has 24 divisors (see below), whose sum is σ = 293806173960. Its totient is φ = 133146832896.

The previous prime is 201561745037. The next prime is 201561745051. The reversal of 201561745041 is 140547165102.

201561745041 is a `hidden beast` number, since 2 + 0 + 1 + 561 + 7 + 4 + 50 + 41 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48918380625 + 152643364416 = 221175^2 + 390696^2 .

It is not a de Polignac number, because 201561745041 - 2² = 201561745037 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201561744987 and 201561745005.

It is not an unprimeable number, because it can be changed into a prime (201561745031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3733045 + ... + 3786653.

It is an arithmetic number, because the mean of its divisors is an integer number (12241923915).

Almost surely, 2^201561745041 is an apocalyptic number.

It is an amenable number.

201561745041 is a deficient number, since it is larger than the sum of its proper divisors (92244428919).

201561745041 is a wasteful number, since it uses less digits than its factorization.

201561745041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57425 (or 57422 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 201561745041 in words is "two hundred one billion, five hundred sixty-one million, seven hundred forty-five thousand, forty-one".