201660156 has 36 divisors (see below), whose sum is σ = 510221712. Its totient is φ = 67158144.

The previous prime is 201660133. The next prime is 201660157. The reversal of 201660156 is 651066102.

It is a happy number.

201660156 is a `hidden beast` number, since 2 + 0 + 1 + 6 + 601 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201660157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54105 + ... + 57711.

Almost surely, 2^201660156 is an apocalyptic number.

It is an amenable number.

201660156 is an abundant number, since it is smaller than the sum of its proper divisors (308561556).

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

201660156 is a wasteful number, since it uses less digits than its factorization.

201660156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5170 (or 5165 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 201660156 is about 14200.7097005748. The cubic root of 201660156 is about 586.4171995188.

The spelling of 201660156 in words is "two hundred one million, six hundred sixty thousand, one hundred fifty-six".