201660240 has 80 divisors (see below), whose sum is σ = 626531328. Its totient is φ = 53657088.

The previous prime is 201660223. The next prime is 201660241. The reversal of 201660240 is 42066102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201660241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184977 + ... + 186063.

Almost surely, 2^201660240 is an apocalyptic number.

201660240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

201660240 is the 11595-th pentagonal number.

It is an amenable number.

201660240 is an abundant number, since it is smaller than the sum of its proper divisors (424871088).

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

201660240 is a wasteful number, since it uses less digits than its factorization.

201660240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876 (or 1870 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 201660240 is about 14200.7126581732. The cubic root of 201660240 is about 586.4172809414.

The spelling of 201660240 in words is "two hundred one million, six hundred sixty thousand, two hundred forty".