201966660 has 144 divisors (see below), whose sum is σ = 709363200. Its totient is φ = 45556992.

The previous prime is 201966659. The next prime is 201966689. The reversal of 201966660 is 66669102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98526 + ... + 100554.

Almost surely, 2^201966660 is an apocalyptic number.

201966660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201966660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354681600).

201966660 is an abundant number, since it is smaller than the sum of its proper divisors (507396540).

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

201966660 is a wasteful number, since it uses less digits than its factorization.

201966660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 201966660 is about 14211.4974580443. The cubic root of 201966660 is about 586.7141483321.

The spelling of 201966660 in words is "two hundred one million, nine hundred sixty-six thousand, six hundred sixty".