203632544161 has 4 divisors (see below), whose sum is σ = 204506503812. Its totient is φ = 202758584512.

The previous prime is 203632544147. The next prime is 203632544177. The reversal of 203632544161 is 161445236302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86021957025 + 117610587136 = 293295^2 + 342944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203632544161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203632544161.

It is not an unprimeable number, because it can be changed into a prime (203632545161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436979476 + ... + 436979941.

It is an arithmetic number, because the mean of its divisors is an integer number (51126625953).

Almost surely, 2^203632544161 is an apocalyptic number.

It is an amenable number.

203632544161 is a deficient number, since it is larger than the sum of its proper divisors (873959651).

203632544161 is an equidigital number, since it uses as much as digits as its factorization.

203632544161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873959650.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 203632544161 in words is "two hundred three billion, six hundred thirty-two million, five hundred forty-four thousand, one hundred sixty-one".