216543026045 has 16 divisors (see below), whose sum is σ = 262178450352. Its totient is φ = 171683527680.

The previous prime is 216543026041. The next prime is 216543026123. The reversal of 216543026045 is 540620345612.

It can be written as a sum of positive squares in 8 ways, for example, as 35426391961 + 181116634084 = 188219^2 + 425578^2 .

It is not a de Polignac number, because 216543026045 - 2² = 216543026041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216543026041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9171155 + ... + 9194735.

It is an arithmetic number, because the mean of its divisors is an integer number (16386153147).

Almost surely, 2^216543026045 is an apocalyptic number.

It is an amenable number.

216543026045 is a deficient number, since it is larger than the sum of its proper divisors (45635424307).

216543026045 is a wasteful number, since it uses less digits than its factorization.

216543026045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39952.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 216543026045 in words is "two hundred sixteen billion, five hundred forty-three million, twenty-six thousand, forty-five".