56203521561 has 48 divisors (see below), whose sum is σ = 89527643712. Its totient is φ = 33693004800.

The previous prime is 56203521547. The next prime is 56203521631. The reversal of 56203521561 is 16512530265.

56203521561 is a `hidden beast` number, since 5 + 62 + 0 + 35 + 2 + 1 + 561 = 666.

It is not a de Polignac number, because 56203521561 - 2¹⁴ = 56203505177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56203521061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5823606 + ... + 5833248.

It is an arithmetic number, because the mean of its divisors is an integer number (1865159244).

Almost surely, 2^56203521561 is an apocalyptic number.

It is an amenable number.

56203521561 is a deficient number, since it is larger than the sum of its proper divisors (33324122151).

56203521561 is a wasteful number, since it uses less digits than its factorization.

56203521561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10294 (or 10291 counting only the distinct ones).

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

The spelling of 56203521561 in words is "fifty-six billion, two hundred three million, five hundred twenty-one thousand, five hundred sixty-one".