545666545 has 4 divisors (see below), whose sum is σ = 654799860. Its totient is φ = 436533232.

The previous prime is 545666543. The next prime is 545666551.

545666545 is nontrivially palindromic in base 10.

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 334487521 + 211179024 = 18289^2 + 14532^2 .

It is a cyclic number.

It is not a de Polignac number, because 545666545 - 2¹ = 545666543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 545666495 and 545666504.

It is not an unprimeable number, because it can be changed into a prime (545666543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54566650 + ... + 54566659.

It is an arithmetic number, because the mean of its divisors is an integer number (163699965).

Almost surely, 2^545666545 is an apocalyptic number.

It is an amenable number.

545666545 is a deficient number, since it is larger than the sum of its proper divisors (109133315).

545666545 is a wasteful number, since it uses less digits than its factorization.

545666545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109133314.

The product of its digits is 2160000, while the sum is 46.

The square root of 545666545 is about 23359.5065230411. The cubic root of 545666545 is about 817.1637811007.

The spelling of 545666545 in words is "five hundred forty-five million, six hundred sixty-six thousand, five hundred forty-five".