201616561550 has 24 divisors (see below), whose sum is σ = 387103801152. Its totient is φ = 78045120000.

The previous prime is 201616561507. The next prime is 201616561561. The reversal of 201616561550 is 55165616102.

It is a happy number.

201616561550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65036051 + ... + 65039150.

It is an arithmetic number, because the mean of its divisors is an integer number (16129325048).

Almost surely, 2^201616561550 is an apocalyptic number.

201616561550 is a deficient number, since it is larger than the sum of its proper divisors (185487239602).

201616561550 is a wasteful number, since it uses less digits than its factorization.

201616561550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130075244 (or 130075239 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 201616561550 in words is "two hundred one billion, six hundred sixteen million, five hundred sixty-one thousand, five hundred fifty".