545241623561 has 4 divisors (see below), whose sum is σ = 545264433300. Its totient is φ = 545218813824.

The previous prime is 545241623527. The next prime is 545241623567. The reversal of 545241623561 is 165326142545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165326142545 = 5 ⋅33065228509.

It can be written as a sum of positive squares in 2 ways, for example, as 382938192400 + 162303431161 = 618820^2 + 402869^2 .

It is a cyclic number.

It is not a de Polignac number, because 545241623561 - 2³⁸ = 270363716617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545241623567) 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, 11368976 + ... + 11416833.

It is an arithmetic number, because the mean of its divisors is an integer number (136316108325).

Almost surely, 2^545241623561 is an apocalyptic number.

It is an amenable number.

545241623561 is a deficient number, since it is larger than the sum of its proper divisors (22809739).

545241623561 is a wasteful number, since it uses less digits than its factorization.

545241623561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22809738.

The product of its digits is 864000, while the sum is 44.

The spelling of 545241623561 in words is "five hundred forty-five billion, two hundred forty-one million, six hundred twenty-three thousand, five hundred sixty-one".