201661604334 has 12 divisors (see below), whose sum is σ = 436933476096. Its totient is φ = 67220534772.

The previous prime is 201661604327. The next prime is 201661604371. The reversal of 201661604334 is 433406166102.

201661604334 is a `hidden beast` number, since 2 + 0 + 1 + 6 + 616 + 0 + 4 + 3 + 34 = 666.

201661604334 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5601711214 + ... + 5601711249.

It is an arithmetic number, because the mean of its divisors is an integer number (36411123008).

Almost surely, 2^201661604334 is an apocalyptic number.

201661604334 is an abundant number, since it is smaller than the sum of its proper divisors (235271871762).

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

201661604334 is a wasteful number, since it uses less digits than its factorization.

201661604334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11203422471 (or 11203422468 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 201661604334 in words is "two hundred one billion, six hundred sixty-one million, six hundred four thousand, three hundred thirty-four".