209689741545 has 48 divisors (see below), whose sum is σ = 341600011200. Its totient is φ = 109837385856.

The previous prime is 209689741523. The next prime is 209689741589. The reversal of 209689741545 is 545147986902.

209689741545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209689741545 - 2¹⁰ = 209689740521 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23495454 + ... + 23504376.

It is an arithmetic number, because the mean of its divisors is an integer number (7116666900).

Almost surely, 2^209689741545 is an apocalyptic number.

It is an amenable number.

209689741545 is a deficient number, since it is larger than the sum of its proper divisors (131910269655).

209689741545 is an equidigital number, since it uses as much as digits as its factorization.

209689741545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9414 (or 9347 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 60.

The spelling of 209689741545 in words is "two hundred nine billion, six hundred eighty-nine million, seven hundred forty-one thousand, five hundred forty-five".