201640561212 has 12 divisors (see below), whose sum is σ = 470494642856. Its totient is φ = 67213520400.

The previous prime is 201640561207. The next prime is 201640561259. The reversal of 201640561212 is 212165046102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 201640561212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8401690039 + ... + 8401690062.

Almost surely, 2^201640561212 is an apocalyptic number.

It is an amenable number.

201640561212 is an abundant number, since it is smaller than the sum of its proper divisors (268854081644).

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

201640561212 is a wasteful number, since it uses less digits than its factorization.

201640561212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16803380108 (or 16803380106 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 201640561212 in words is "two hundred one billion, six hundred forty million, five hundred sixty-one thousand, two hundred twelve".