201235051566 has 96 divisors (see below), whose sum is σ = 454565196000. Its totient is φ = 65989458432.

The previous prime is 201235051559. The next prime is 201235051583. The reversal of 201235051566 is 665150532102.

201235051566 is a `hidden beast` number, since 2 + 0 + 12 + 35 + 0 + 51 + 566 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 201235051566.

It is a congruent number.

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, 163738240 + ... + 163739468.

It is an arithmetic number, because the mean of its divisors is an integer number (4735054125).

Almost surely, 2^201235051566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201235051566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227282598000).

201235051566 is an abundant number, since it is smaller than the sum of its proper divisors (253330144434).

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

201235051566 is a wasteful number, since it uses less digits than its factorization.

201235051566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955 (or 1876 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 201235051566 its reverse (665150532102), we get a palindrome (866385583668).

The spelling of 201235051566 in words is "two hundred one billion, two hundred thirty-five million, fifty-one thousand, five hundred sixty-six".