16561546365053 has 4 divisors (see below), whose sum is σ = 17535754974780. Its totient is φ = 15587337755328.

The previous prime is 16561546364983. The next prime is 16561546365073. The reversal of 16561546365053 is 35056364516561.

It is a happy number.

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 14990238988729 + 1571307376324 = 3871723^2 + 1253518^2 .

It is a cyclic number.

It is not a de Polignac number, because 16561546365053 - 2⁴⁰ = 15462034737277 is a prime.

It is a super-3 number, since 3×16561546365053³ (a number of 41 digits) contains 333 as substring.

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 16561546365053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561546365073) 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, 487104304838 + ... + 487104304871.

It is an arithmetic number, because the mean of its divisors is an integer number (4383938743695).

Almost surely, 2^{16561546365053} is an apocalyptic number.

It is an amenable number.

16561546365053 is a deficient number, since it is larger than the sum of its proper divisors (974208609727).

16561546365053 is an equidigital number, since it uses as much as digits as its factorization.

16561546365053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974208609726.

The product of its (nonzero) digits is 29160000, while the sum is 56.

The spelling of 16561546365053 in words is "sixteen trillion, five hundred sixty-one billion, five hundred forty-six million, three hundred sixty-five thousand, fifty-three".