36561544221 has 32 divisors (see below), whose sum is σ = 50997340800. Its totient is φ = 23277363200.

The previous prime is 36561544213. The next prime is 36561544237. The reversal of 36561544221 is 12244516563.

It is a cyclic number.

It is not a de Polignac number, because 36561544221 - 2³ = 36561544213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 36561544221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36561542221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2920786 + ... + 2933276.

It is an arithmetic number, because the mean of its divisors is an integer number (1593666900).

Almost surely, 2^36561544221 is an apocalyptic number.

It is an amenable number.

36561544221 is a deficient number, since it is larger than the sum of its proper divisors (14435796579).

36561544221 is a wasteful number, since it uses less digits than its factorization.

36561544221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13037.

The product of its digits is 172800, while the sum is 39.

The spelling of 36561544221 in words is "thirty-six billion, five hundred sixty-one million, five hundred forty-four thousand, two hundred twenty-one".