545344225021121 has 4 divisors (see below), whose sum is σ = 545498757250500. Its totient is φ = 545189692791744.

The previous prime is 545344225021093. The next prime is 545344225021147. The reversal of 545344225021121 is 121120522443545.

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 170823227044096 + 374520997977025 = 13069936^2 + 19352545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545344225021121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545344225081121) 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, 77266109396 + ... + 77266116453.

It is an arithmetic number, because the mean of its divisors is an integer number (136374689312625).

Almost surely, 2^{545344225021121} is an apocalyptic number.

It is an amenable number.

545344225021121 is a deficient number, since it is larger than the sum of its proper divisors (154532229379).

545344225021121 is a wasteful number, since it uses less digits than its factorization.

545344225021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154532229378.

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 545344225021121 its reverse (121120522443545), we get a palindrome (666464747464666).

The spelling of 545344225021121 in words is "five hundred forty-five trillion, three hundred forty-four billion, two hundred twenty-five million, twenty-one thousand, one hundred twenty-one".