201242355660 has 96 divisors (see below), whose sum is σ = 627173373120. Its totient is φ = 53571538944.

The previous prime is 201242355647. The next prime is 201242355701. The reversal of 201242355660 is 66553242102.

201242355660 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 42 + 3 + 556 + 60 = 666.

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 31 ways as a sum of consecutive naturals, for example, 11359 + ... + 634518.

It is an arithmetic number, because the mean of its divisors is an integer number (6533055970).

Almost surely, 2^201242355660 is an apocalyptic number.

201242355660 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 201242355660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313586686560).

201242355660 is an abundant number, since it is smaller than the sum of its proper divisors (425931017460).

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

201242355660 is a wasteful number, since it uses less digits than its factorization.

201242355660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646472 (or 646464 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 201242355660 its reverse (66553242102), we get a palindrome (267795597762).

The spelling of 201242355660 in words is "two hundred one billion, two hundred forty-two million, three hundred fifty-five thousand, six hundred sixty".