201561528546 has 128 divisors (see below), whose sum is σ = 521309952000. Its totient is φ = 56533401792.

The previous prime is 201561528451. The next prime is 201561528559. The reversal of 201561528546 is 645825165102.

201561528546 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 615 + 28 + 5 + 4 + 6 = 666.

201561528546 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16876645 + ... + 16888583.

It is an arithmetic number, because the mean of its divisors is an integer number (4072734000).

Almost surely, 2^201561528546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201561528546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260654976000).

201561528546 is an abundant number, since it is smaller than the sum of its proper divisors (319748423454).

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

201561528546 is a wasteful number, since it uses less digits than its factorization.

201561528546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12773 (or 12767 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 201561528546 in words is "two hundred one billion, five hundred sixty-one million, five hundred twenty-eight thousand, five hundred forty-six".