209224505545 has 12 divisors (see below), whose sum is σ = 275968852740. Its totient is φ = 152163276320.

The previous prime is 209224505533. The next prime is 209224505563. The reversal of 209224505545 is 545505422902.

It can be written as a sum of positive squares in 2 ways, for example, as 130907923344 + 78316582201 = 361812^2 + 279851^2 .

It is not a de Polignac number, because 209224505545 - 2⁷ = 209224505417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172912210 + ... + 172913419.

It is an arithmetic number, because the mean of its divisors is an integer number (22997404395).

Almost surely, 2^209224505545 is an apocalyptic number.

It is an amenable number.

209224505545 is a deficient number, since it is larger than the sum of its proper divisors (66744347195).

209224505545 is a wasteful number, since it uses less digits than its factorization.

209224505545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345825656 (or 345825645 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 209224505545 in words is "two hundred nine billion, two hundred twenty-four million, five hundred five thousand, five hundred forty-five".