209143457055 has 64 divisors (see below), whose sum is σ = 417820677120. Its totient is φ = 98486264448.

The previous prime is 209143457051. The next prime is 209143457071. The reversal of 209143457055 is 550754341902.

209143457055 is a `hidden beast` number, since 2 + 0 + 9 + 143 + 457 + 0 + 55 = 666.

It is not a de Polignac number, because 209143457055 - 2² = 209143457051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 209143457055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209143457051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2550289 + ... + 2631018.

It is an arithmetic number, because the mean of its divisors is an integer number (6528448080).

Almost surely, 2^209143457055 is an apocalyptic number.

209143457055 is a deficient number, since it is larger than the sum of its proper divisors (208677220065).

209143457055 is a wasteful number, since it uses less digits than its factorization.

209143457055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5181357 (or 5181351 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

Adding to 209143457055 its reverse (550754341902), we get a palindrome (759897798957).

The spelling of 209143457055 in words is "two hundred nine billion, one hundred forty-three million, four hundred fifty-seven thousand, fifty-five".