209840625894853 has 8 divisors (see below), whose sum is σ = 222310937273688. Its totient is φ = 197384397310464.

The previous prime is 209840625894803. The next prime is 209840625894859. The reversal of 209840625894853 is 358498526048902.

It can be written as a sum of positive squares in 4 ways, for example, as 2746451046564 + 207094174848289 = 1657242^2 + 14390767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209840625894853 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 (209840625894859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3520667926 + ... + 3520727527.

It is an arithmetic number, because the mean of its divisors is an integer number (27788867159211).

Almost surely, 2^{209840625894853} is an apocalyptic number.

It is an amenable number.

209840625894853 is a deficient number, since it is larger than the sum of its proper divisors (12470311378835).

209840625894853 is a wasteful number, since it uses less digits than its factorization.

209840625894853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041397223.

The product of its (nonzero) digits is 1194393600, while the sum is 73.

The spelling of 209840625894853 in words is "two hundred nine trillion, eight hundred forty billion, six hundred twenty-five million, eight hundred ninety-four thousand, eight hundred fifty-three".